The thing is people use exchanges only for the short trades they make and some people on the forums I'm sure don't store bitcoins on binance or other centralized exchanges but because binance provides a trading service some people still use them today in trading. I've used Binance several times for short trades but it's not for long term use and for day traders maybe some people use a centralized exchange only for trading.
Because it's impossible every day they have to transfer assets to their wallet every time they finish trading, Bitcoin has never followed that centralized exchange which you have to understand and bitcoin has never had anything in common with exchanges as the two are quite different. Who cares if binance is lost or not?
Oh, believe me, many, many people store their assets on exchanges, even many on this forum do so. If you remember how exchanges scammed and got hacked, there were so many sufferers and lost funds!
If we'll look at how many bitcoins of clients Binance stores on its wallets, it will be a significant amount. So any problems with Binance will definitely impact the entire crypto market. This is a situation when the quantity is turned into quality.
Not to be worried a lot we should remember that 1
BTC is always 1
BTC. All temporary problems with centralized projects will pass and what we have will stay with us.