That would be on Google. If Google says the phone with zero updates for 5 years passes system integrity, then who we are to argue
Of course they pass system integrity. The whole point of the thing is not "it should be secure", it's "the user has not messed with it so we control it".
For Google control is the issue (and the data flowing with it), not security, and once again we in Europe just swallow that shit and mess up our supposed "open" standards. In this case it really is because there are no competent people making these decisions. They just trust Google when they say: "It's for security".
I think what we need to do is all complain in the same way, something akin to: GrapheneOS is the most secure Android option, it's just not catering to Google by sharing all user data with them. You are falling for the false argument from Google that this is about security. It's not, it's more about sovereignty and control. And you and your bank are catering to Google/the US and YOU are throwing YOUR privacy conscious users under the bus, because you do not fully understand the forces at play.
Idk, this can be much improved :)