But we don't have anything like FF as an alternative to go from Android. Especially considering banks require "certified OS".
https://grapheneos.org/releases
(Pixels only)
Go for Calyx or any other android distro, they have zero difficulties in supporting more devices.
It's not our fault that the only other devices providing the security features we need don't allow GrapheneOS to be installed or to use those features. Massively lowering our standards and using low security hardware missing the basics we depend on and have built major protections around wouldn't make sense. It's not what GrapheneOS exists to provide. People can use LineageOS if they don't have the same priorities we do.