"Only"? Isn't this most of the Android phones?

And all of the ones that work with banks and other apps people absolutely need to have, in order to function in society.

It's bad.

There are bank apps that work on non-certified devices

Thats great but I need my bank app to work not some random one

Yes, but worth noting, "device" in this context means hardware and software combined. Custom ROMs et al make a device not certified