They’re pretty common and the functionality is often not even obscure. Plenty of ROMs out there are unable to make full use of the fancy cameras on some phones without jumping through hoops because of driver issues. That’s not an insignificant thing. I’ve seen NFC and e-sim being unavailable as well, which are also not very obscure features.
i never experienced point 2 or 3 in all my years of using them.
the problem for me is usually integrity api.
They’re pretty common and the functionality is often not even obscure. Plenty of ROMs out there are unable to make full use of the fancy cameras on some phones without jumping through hoops because of driver issues. That’s not an insignificant thing. I’ve seen NFC and e-sim being unavailable as well, which are also not very obscure features.