You can have a shared family room computer! It works really well. No screens in the bedroom is a great idea. iPhones with strict Screen Time settings are awesome when the kids get old enough to use a phone for communication but not old enough to handle a phone with games and the full Internet
My 16 yr old just had his phone update and apply his old screen time settings from 4 or 5 years ago. Sorry kiddo, don’t remember the screen time password.
Now why they came back, and weren’t working before? The restrictions were so full of holes that they didn’t really work as anything other than a speedbump.
And since you have root certs on the devices, you can decrypt traffic and uniquely identify devices and block internet from your central management, at any time, regardless if the phone is on your wifi vs a friend's vs mobile data.