One more disadvantage for me on the Blockstream Green wallet is its Multisignature Model. User can't spend their coin themselves, the transactions should sign from both side user and wallet author. Even you have a mnemonic phrase you have to wait for expire you 2FA authentication.
The first way to spend coins is using signatures from 2 different keys to send coins. One is held by the user in the form of the mnemonic, which the service never knows. The other is stored on our server, and we sign your transactions with it after any Two-Factor Authentication you have enabled verifies the transaction.
This means that, unlike custodial solutions, we can never steal your coins, since we don’t know your mnemonic. Even if we get hacked, or taken over by a government entity, or something else catastrophic happens, no one can steal your coins.
On the user side, even if someone steals your mnemonic, they cannot spend your coins unless they can access your Two-Factor Authentication. This is the type of security that other wallets do not offer.
The second way to spend coins becomes available after your two factor recovery period expires. Once this happens, you can spend your coins without our service needing to also sign. This is to ensure that no matter what happens, you can always get your coins back.
Our signature scheme also allows us to enforce Two-Factor Authentication security, Two- Factor Authentication spending thresholds, and other extra options. These features do not exist in typical Bitcoin wallets.
Perhaps it would be an advantage for some users, but not for me. I know there would be some alternative way to recover your funds. But my question is why should I involved with some problems that I don't like? If I can't save my seed/mnemonics then no one can save my funds. But I don't like that someone will have control over my funds. We can say is a semi custodial wallet IMO.
I will prefer to read Blockstream Green wallets documentation before using it. So you will have full knowledge about what are you using.