Have you ever actually tried to support a grandparent type? It's always easy when you've never done it.
What you are missing is it isn't always easy to teach a new operating system to someone with cognitive decline.
(And if we are picturing a grandparent without cognitive decline your suggestions makes even less sense.)
Anyway, their Windows laptop got all sorts of shit "side-loaded" (and I have a benign theory about this happened), and put them on iPad like 15 years ago. You can object to the closed system, but zero tech support calls for me.