I wonder if they'd still pick that if they had the option of a Chaumian ecash system?

It seems like the place where you really want attribution is on the system operators. In the "community bank" model, you want to be able to go find the operators if they collude and abscond with the bank's money. It's not obvious to me that you need that kind of attribution for users/customers of the bank.

rijndael

However the Bitcoin Beach and Bitcoin Lake folks do actually like the fact that users of the system are known and have usernames, which is incompatible with the perfect privacy of chaumian ecash.

fiatjaf

bitcoin

Standard Sats against Fedimint Hype

notgeld

I see the model as trying to make something like Bitcoin Beach be turnkey, and with better privacy and less custodial risk. Less “get together with some friends and run a bank”, more “a bank for your town/community”