Not only will there always be unregistered gold circulating in the market, but there will also be fake gold circulating. And everytime some gets taken out of circulation, some new fake gold gets put into circulation. People get scammed and lose their money. So physically verifying gold? You pretty much have to go on trust. Mostly trust that the gold is real and the examination/verification was flawless. Which is never a certainty.

Bitcoin would never have this problem. Bitcoin verification is a work of art that cannot be fooled, replicated or faked.

You can not verify gold by yourself and you have to rely on gold companies as well as quality check mark from any qualified entity to "believe" that physical gold bars you own or are interested to buy are actually good one in quality. While as always, there are many scammers in any industry so there is a lot of risk that you can buy fake gold bars or unqualified gold bars.

With real estates, you have to rely to the others too and you never know about a real estate's construction quality and durability against physical threats. You again have to rely on third party entities for inspections for example.

With Bitcoin, it's very simple. Copy and paste a Bitcoin address to a block explorer, you can both easily and quickly check that address balance, and any amount of bitcoin shown in that address is truly real bitcoin, there is no chance and risk of fake coins there.

Do you remember a conversation between Changpeng Zao and Peter Schiff in a blockchain conference, on stage, CZ challenged Peter Schiff like how he can know a gold bar given by CZ is a real one.

Peter Schiff actually failed with this challenge, but it's not surprising at all.
https://www.benzinga.com/crypto/cryptocurrency/25/12/49216807/bitcoin-critic-peter-schiff-challenged-on-stage-can-he-tell-whether-a-gold-bar-is-real

[LIST] Useful Bitcoin block explorers.

It seems like it's currently very difficult to find easily verified assets, except for Bitcoin. Unlike other assets, BTC is often difficult to verify. So, in essence, BTC is a good asset and certainly different from the others. However, gold is also a good asset because it's physical, and it's rare to be disappointed by holding gold for the long term, as long as it's real gold. After reading this topic, I'm more enthusiastic about trading because it turns out BTC is a good asset, and it seems very difficult to find an asset that can compete with BTC.

But I think this topic is very good, and it certainly makes us realize that BTC is a good asset that is certainly different from other assets.