Reading the thread Using USAA for Zelle
from the beginning, it appears there were issues in the past.
That’s why there was reluctance.
Would be good to be able to add it, but perhaps with some kind of test phase. In order to limit the number of issues if problem appears.
I don’t know if this is feasible in Bisq (and if it is not overcomplicated to implement).
ping @ManfredKarrer . What do you think today about USAA ?