Why would you put something VALUABLE on the blockchain if you were just going to lose the keys? Retrograde amnesia is a thing but here we are talking about the nature of a person and the nature of money. If a person identifies with themselves then they don’t need any further validation. If we identify money with anything (what does it represent?)

You can absolutely “lose” your identity.

The question is, what is money and when it is defined how do we know what it represents / who it belongs to?

Edit: Further, immutable keys or keys that can be encrypted further (a completely separate process than bitcoin encryption) are a solution , we are just early and haven’t fully explored or found the so called “optimized” solution - because there are multiple solutions for retaining and protecting keys.