I checked Muun wallet recently, but I was discouraged with what I noticed about the wallet.
First, the wallet encourage email and password to be used as backup, that makes me think it is a web wallet. If it is a web wallet, it is one of the wallet I can not use because the least secure wallet type I can use are mobile and desktop wallet where my private key is not backed up on a cloud.
Second, you can skip email and password as backup. If skipped, the wallet will generate you 32 numbers and alphabets in total which are not seed phrase but numbers and alphabets.
So 'email and password', or 'numbers and alphabets' is the recovery code on Muun wallet, that is kind of absurd.
Any of the Taproot wallets listed support Taproot Address Private Key importation?
We use to say: "Dont trust, verify.", not everyone have knowledge to verify the code of one open source APP wallet, but anyone can generate a 256 bits keys and convert it to a Taproot Address, so, why most of wallets don't let user import his own Private Keys?
Wallet like Bitcoin Core only support private key importations, but it is a full client wallet, which might discourage light client users. If you can recover using seed phrase, I think that is enough because seed phrase is even easy as backup, for recovery.