Just curious, would you say that the loss of convenience with a random strong power is worth the extra security?

Yes. 100% yes.

but do you think there is a middlepoint between accesibility and security?

Yes, there is always a trade-off. But in this case, based on actual practical experience dealing with real world users, the trade-off seems clear to me. The choice basically comes down to one of the following two options:

1. force users to learn how to use a password manager to securely use these blockchain systems, possibly scaring some of them away initially; or,
2. make it slightly easier for them to start using the system and then piss them off and likely permanently drive them away from the system when they get hacked and all their money is stolen because of their insecure password.