You can easily create as many wallets as you'd like, and keep your funds isolated from a wallet you use as an identity, if you wanted. There are multi-key wallets out there as well to retain control of your wallet in the event that one of the keys are compromised. I haven't used any of those personally myself so I can't really elaborate more on those types of wallets, but it feels like being able to lower risk is a solvable problem.

Solvable, but how much more complex than today's methods? Most people can't understand these systems and are hesitant to adopt

I know there are some people who genuinely believe that's a perfectly fine risk and that it's entirely your fault to live with the consequences if you lose the key.