Useless, it just protect against someone to access your wallet, but a hacker can find a way to skip 2FA verification.

Why you need to logout from your wallet? are you really sure want to import 12 or 24 keys everytime you want to access your wallet? it's time consuming and you're not protect anything if someone can steal your seed pharse.

What does it mean? custodial wallet is really a worst wallet lol, you must not let third party to control your wallet.

Doesn't help that much, most people wouldn't re-check the address and amount they want to send since they're already think they're correct.