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Yep. People love to make blanket statements like this without remembering how hard it was for parents to supervise Internet use even when there was only one Desktop computer in the family area. Nowadays you can almost any device to lookup porn.

When I was growing up home LANs weren't common, but nowadays you could solve it with just a little box that does all the filtering in a way that can't be bypassed. Blocking connections to non-whitelisted domains based on the internal IP or MAC is pretty easy. If people don't use these solutions it's because they either haven't researched enough or don't want to deal with the inconvenience (or, in at least some cases, don't really care).

and I was so sure that this time, the best course of action was also the easiest

"they can't get offline because they're now online" doesn't make any sense

Take the homework offline, remove screens from schools,