i think a lot of confusion on quantum and btc is that everyone frames it as a tech problem, but what makes the problem specifically unique to btc is that the tech problem is secondary
quantum resistant bitcoin will be feasible but it doesn't solve what you do with the old coins

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you could develop the perfect way to migrate btc to post quantum. pretend the signatures won't be more expensive, btc scalability will allow migration, etc. take away all of these tech issues and assume it's super simple.
it is still impossible to solve the old coins problem.

this is why quantum is unique to btc. yes, there are tech reasons, but the tech is not the biggest issue, and it's no fault of btc other than being first and having a ton of lost coins.

and satoshi being kind of dumb and mining to a bunch of p2pk wallets for some insane reason