I would agree when it comes to the most basic real-world skills, but even then you cannot prohibit it. When it comes to digital skills, no, you cannot expect everyone to understand it. Even when it comes to GUI tools. It's just not realistic.
Sounds like a great way to stunt development. Alcohol and cigarettes are unambiguously harmful to children. Computing is not so unambiguous, it has a lot of benefits. How many of us here would lead very different lives if we were treated that way?
you can provide gimped versions. micro controllers, school laptops that don't go places they shouldn't go, gimmicky age checks on anything they can use outside of adult supervision.
Define 'gimped', microcontrollers are able to play NSFW games in Spanish/English for the Z-Machine interpreter. An ESP32 it's more than enough. A Game Boy it's more than enough, too. Ditto with 8/16 bit microcomputer out there. I can even run these games under FreeDOS. Good luck implementing accounts on that.
And the example it's I-0, (I-0.z5, Interstatal Zero) both in English and the faithfully Spanish translation done from the Spanish IF community. Both games are nearly 30 years old.
This could be an option with children under the age of 12. Maybe only let them use a computer or gaming console in the living room, or something like that.
There's really a wide range between "not looking after kids" and "watching them every second." Unlike the physical world, digital items allow kids to transition from a totally safe space to an unsafe space within seconds.
For example, I can have my kid do whatever he wants in his room. I know what's in there and while he may have the occasional stupid idea, it's all fundamentally safe.
But even a tablet breaks that barrier. It's entirely safe for him to listen to music and stories and I want him to be able to do that unsupervised. But solid control over content on Spotify isn't a thing. The catalog contains things that I consider not appropriate for him. And they've lately been adding vidoes to the feed and while I know he tries hard to resist, they deliberately push videos further and further up. So we're back to "I can turn on the story for you and you can listen.", which is super stupid and could be much better if I had solid controls that I can trust.
Yes, I know I can talk to him about not watching the videos. How can an 8 year old compete with the combined effort of the Spotify team paid to make him watch videos? That's just not feasible.
If Spotify doesn't give you the controls you want... Don't use Spotify?
If my local park had a series of rotating knives and the council refused to do anything about it, I wouldn't let my kids go down there, supervised or not.
I agree parenting in the digital world is harder. You either learn how to do it to your standard or you don't allow the child to be part of that world if you are incapable or don't want to.