I agree with you about the convenience of using a multi-currency purse, because with a lot of wallets you can just get confused and it's very inconvenient.
In such cases, to quickly find the right coin, users usually use the search for a coin ticker.
For me, the inconvenience is passwords and key phrases. As you understand, for each purse they must be unique.
The chance to forget or lose the password is big enough and as a result - a complete loss of crypto currency. I like that OPTHERIUM has biometric protection.