Parental controls aren't baked in, they're bolted on and half-assed. One of them I've noticed over the years... I can't disallow Plex except at the app level (outside of Plex entirely). I can't easily give access to the educational libraries, but disallow it to the entertainment libraries. There are a million little anecdotes like that, because no one gives a shit about the problem.
Many parents, I think, are left with all-or-nothing choices. And it's not long before the reddit crowd starts insinuating that the reason your kid doesn't have a phone is so they can't call for help... from you.
It's a big clusterfuck.