I'll take a stab at that, although I don't think it's stupid per-se. Everyone I talk to, I talk to via WhatsApp, LINE, or FB Messenger, and generally I only use that method to talk to them, whatever else they're on. All of those have easy one-press buttons to initiate video call. Using some kind of Apple-only technology?

I mean I think most people I know are probably on an iPhone, but having to remember everyone's device to know if they can FaceTime? Ugh. I suspect I could work out how to FaceTime someone if you made me, but I'd have to work it out rather than just knowing it.