You are sort of giving away the game here.

You are acknowledging that technology, specifically the smartphone, is bad for learning environments. This is a statement that extends beyond the classroom, because why would a smartphone be bad in the classroom for learning but not bad for learning when they're doing homework outside the classroom?

I'm old enough to have straddled the analog to digital transition. This likely results in a higher amount of internalized skepticism about technology than those who grew up as digital natives. With that out of the way, I think your lockdown plan is a bit misguided. We should not lockdown technology like this, we should ban it for learning. I know that may sound insane, but every interaction I have with younger people who grew up as digital natives shows they have a weaker and weaker grasp of everything from the underlying theory of whatever technical issue we are talking about to the basic ability to communicate their thoughts in writing. This is only going to get worse with AI.

There's a reality here in 5-10 years from now where there's a bunch of olds who know roughly how things work, and the following generation who has no clue and not only has no impetus to learn, but no ability. That's the difference between the prior "old man yells at cloud eras". At least in prior instances the follow-on generation could actually learn the job.