I don’t use web3 wallet because I’m playing with Bitcoin sent directly from Electrum but that doesn’t mean I shouldn’t play here because I don’t use web3 wallet.
That's why, they have (Email) with passwordless authentication. Everything uses a 2FA code sent to your email.
Yes, it's a bit annoying. IMO, it's the second option for the user because they want or are focused on advising the user with using the web3 wallet. Also each casino have different system, no need to have the same system as others.
I don't think the current login system is difficult unless you are using it. IDK why you don't web3 wallet, but you have at least (Metamask), meanwhile Metamask can be instal with (Extension) browser. Meaning you can open both (Metawin + Metamask) at the same, and just use Metamask as login.