Maybe, Maybe not.

Did he give a specific reason as to why he thought it best to use two hardware
wallets? I'm wondering if it from a security aspect, as in someone finding the seed
if he was using just one?

In that case yea its possible to split funds over two wallets and secure them
in two different locations - there isnt necessarily anything negative about
doing so IMO.

I don't see anything bad about storing all your Bitcoin in one hardware cold storage wallet as long as you are going to diligently and internationally handle the security of that wallet and its secret phrase in the right manner. Even if you store you Bitcoin in two or three different hardware wallet and you don't carefully keep your secret phrase safe, chances that you will lose all your Bitcoin in those wallet is there and for you to prevent that, you don't need to be careless with your security. So, even if you have one wallet and you store everything there, you don't have any issue unless your phrase is exposed.

That phrase of not putting all your eggs in one basket was being said to those people that like to invest all their money in just one asset or when someone put their entire hope on something. For the case of Bitcoin wallet, it is clearly advised that investors should have a cold wallet which is usually offline with the seed phrase also backed up offline In a safe place, if that is done, you don't have anything to fear.

It is when you begin to have doubts about the security features of your hardware wallet that's when the thought of nurturing the idea of having two hardware wallets to store your Bitcoin comes to mind. When you actually don't have doubts or trust issues about the security features of your hardware wallet, you won't just see the need to have two hardware wallets; instead, you would prefer having one hardware wallet since it can comfortably serve the purpose of storing up to 1 BTC without having security bridge.

You don't necessarily have to have two hardware wallets. You can, for example, use a hardware wallet to store 0.5 BTC and a cold wallet based on the light Electrum client to store the remaining 0.5 BTC (using two different devices).

In fact, you raise a very interesting question. A hardware wallet is considered a very secure way to store Bitcoin. However, from a paranoid cypherpunk perspective, this is not entirely true. A Bitcoin holder may face various threats and various methods of attack. For example, a hardware wallet has one drawback that is rarely mentioned by those people who advocate storing Bitcoin using a hardware wallet. This drawback is that the very fact that you have a hardware wallet indicates that you have Bitcoin.

I am not sure that the principle of "not putting all your eggs in one basket" should not be applied to the Bitcoin storage system. I doubt it. From a paranoid cypherpunk perspective (I guess), the principle of diversification is a universal principle.

I believe that the subject of first wallets and basic storage questions has been discussed broadly before. Electrum is a great wallet to start out with, and it's pretty basic to set up; even a newbie can do it. As for what your friend told you, I will agree with the previous users; it's about portfolio diversification, not for Bitcoin storage. There's nothing wrong with using a single hardware wallet to store your Bitcoin; they'll be safe. However, I don't see why you couldn't split your coins on a second wallet as well, if that makes you feel safer. The only downside I could think of, apart from overcomplicating things, is the cost of buying a second hardware wallet.

best strategy is to have nearly 1btc in a secure cold wallet, and then a few sats in another wallet as play/losable funds
(hot/cold wallet principles)

the reason
if your exploited by a relative/neighbour someone physically you can give them the small wallet acting as if it is all you have to pacify them into leaving you alone without them getting to your main stash

definitely dont store large life effecting amounts on a web/cellular phone wallet that you access frequently

Hardware wallet are currently the most safest option for a beginner but does that mean the wallet is totally secured? I would say No because we all have seen hardware wallets getting hacked through leak of seed phrases and the likes, yes we all can say that it is dependent on how you handle your back up phrases but one can never be too sure on cases like this.

So I personally agree with your brothers friend, there is no too secure wallet that can defeat the idea of "don’t put all your eggs in one basket" for me he can actually split them into two or more wallet, 1 bitcoin might be small for some investors to split into two wallets but might be huge for some.

The only problem with having two or more wallet is the way you store their seeds do not back them up together do not over spread them for redundancy sake.

For me I think hardware wallets are reliable in terms of your bitcoin been safe however it will be unwise to save all your bitcoin in one wallet no matter how secure the wallet maybe.If you have a reasonable amount of bitcoin in your holdings the best option will be to store them in different hardware wallets to avoid stories.Not that hardware wallets is not good or secure for storing bitcoin but one stand at great financial risks of losing one's bitcoin if the wallet is hacked or being tempered with.

Being someone good in risk management, I'm tempted to agree with him because I see that there is so much wisdom in what he is saying. With just one storage medium, any loss of property or the password will lead to the loss of everything. Instead of this ugly situation to happen, it is better to divide the entire assets into two or three different parts and save them separately. I feel this is a better way of securing one's Bitcoin than keeping everything together. Storage medium can be hardware wallet with open source like you suggested but this time, it could be two of three different hardware wallets.

This is depends on you because if you increase number of your wallets - you will came up in a problem how you will secure it, for example how you will keep your seed phrases/private keys since you will have a lot of wallets here.
But if that is not your concern, then having multiple wallets is fine.

This is also what I understand about "don't put all your eggs in one basket" but depends on how you will use this case, for OP - it's about how you keep your Bitcoins. Which for me, it's still valid.