In and of itself outside of just being MORE there is no difference between .1 or .03 or .5 or 1.5 it's all bitcoin and all spendable.
I think it means different things for different people.
But, you are correct, for most of the people it's just flex.

-Dave

It's because you will be part of the so called 1 bitcoin club, part of a group of bitcoin investors to even own at least 1 BTC. And with bitcoin getting more scarce as time goes on, the price will naturally go up, making you someday a millionaire. So this is the first obvious target for every bitcoin enthusiast.

Or better yet owning 21 bitcoin will be more rare, 21 bitcoin club.

The more the merrier! Who doesn't want to have one full bitcoin in their stash if it can be the reason to achieve financial freedom, being away from risk of inflation and such.

Another reason why lots of people are keen in stacking sats as much as they can is for them to be able to reduce the cost of buying due either from the possibility of price increase in the next few year or decades when the majority of big companies are putting their money simultaneously. Or perhaps, for them, it is just a milestone that they planned before they seriously get into bitcoin.

It depends on every people.

1BTC means increase in USD value by a minimum of 1k or more. This makes the profit bigger as compared to just a few dollars. Plus the advantage of being in 1 BTC club for the name sake. I personally do not believe in it as long as your are holding Bitcoin.

bitcoin price is very expensive for 1 btc only. That's what makes us judge enough with one bitcoin it would be amazing. In this world bitcoin as a whole is only 21 million and so many bitcoin enthusiasts. That's we are sure with 1 btc it is quite remarkable, In fact we can shop with only less than 1 btc or 0.1 0.01 .001 it remains spent that's why bitcoin is so valuable.

I think having 1 full BTC might be a goal for them, honestly if I could have 1 BTC from smaller investment I would also flex them no matter what price it has. Currently I'm a little bit far from it let's hope I would be able to get lucky in trading and increase the number of my Bitcoin.

Depends on the person who you talk or see since someone is just flexing it especially at this time but there are other who like to have a whole BTC for personal satisfaction that they didn't miss something in the bull run or they want to have that for future holdings.

Try marketplace... I can't remember the members who like this stuff (there are few reputable members) and they have some discussions about these coins in their topic! You will have to search for that alone!

Why do people value 1 full BTC?! Well there will be only 21 million BTC, now there is one wallet with 1 million bitcoins locked, many bitcoins are permanently lost... people can search for some calculations about it, and by some it looks like there is 10-20% fewer coins! So one full Bitcoin can give you an advantage one day!
You can have fractions of course, but 1 full sounds a lot better than just fractions...

You can own any fraction of BTC but the more you own bitcoin, the better it is for you and your future. In the near future, there will be very few people who can own full 1 btc so i think we should collect as many bitcoins as possible and keep them HOLD.

Obviously, you have more if you own 1 whole bitcoin than just fractions. And whenever the price increases by $1,000, you'll feel the gains.
Unlike with the slightest amount that you have in fractions, you barely feel the gains.