Yep, I’ve done plenty of custom ROMs, used most mobile OSes out there, etc. but I’m not joking when I say I don’t want to deal with SafetyNet, figuring out what works with/without Play Services and generally getting in bed with Google hardware (but that last bit isn’t privacy oriented.) And no way do I have the time to tell mom how to install Graphene and support it.
Apple’s on-hardware processing for some things is a plus as well. Yes I know it’s their current business plan and can change but they make money on hardware and services, not knowing things.