Agreeing with all that you say, except the claim that preventing technology is BS. If a tablet or smartphone is available it is almost always what kids will choose, if you don't make it available, they can do and learn better things.

Sure, you cannot prevent it forever, but that's not the goal, just to postpone it until they are well-equipped to handle it.

The same really with alcohol or smoking. You cannot prevent your children forever from trying it, but it is a huge difference whether they are exposed to it at 12 or 18. Nobody argues "let children drink and smoke and decide for themselves whether it is good or not".

EDIT: one important aspect is credibility and example. Kids will of course pick up on it if you are addicted to the phone, while you don't let them use it. "Do, don't tell", etc.