> That is the main problem - your kid is going to be pressured to have a social media account.

Indeed, that would be the goal, kids should be able talk to other kids their age.

The problem is, I believe, in the excessive phone and screen usage, but parents are easily able to control that (as opposed to smoking or drinking for example).

Excessive phone usage is only a minor part of the problem. Toxicity of social media is the main one.