Anyway.. if you want to have a conversation about childhood, parenting, suburbs.. quantifications and statistics (assuming that is what you're looking for) are allowed.. but the conversation will be fundamentally subjective.

There's no other way, that isn't meaningless, to have this conversation.

If you want to narrow down, to a specific point that can actually be settled in such a way.. that's great. A great point in the conversation. Not the conversation itself.

There is no way to quantify or settle this debate.. with published social studies. The complex relationship between parental culture, modern childhood, screens, neighborhoods... There is no reason to think this will be modeled out in a comprehensive,"objective" way.

You can make a data centered argument, that is fine. It is not possible to do this honestly, well being both broad and tight.

Iregardless, OP's point stands. "It's the screens."

Trying to isolate kid culture, school culture, parents, parenting.. it can't be done. It's a complex. It is now a complex operating in a highly computerized world. The way to think of it is as one major aggravating factor.. that changing material culture.. and how it is affecting the complex that is parenting-childhood-culture. Every element of that complex is co-evolving tightly interrelated.

If you want to think of this objectively (in a pragmatist sense), which outside (the complex) change is the primary driver. Suburban design, or screens.. a computerization of culture.