It's probably just not so black and white. Every kid is different and I think you just have to observe how they handle different mediums. If I had a kid that really struggles with peer pressure, why would I put them in a situation where it's likely to be heavily amplified (i.e. social media)? But maybe other kids handle it just fine.

FWIW, I let my boys spend a good chunk of hours on video games because I would be a hypocrite otherwise. But there comes a point when their behavior takes a turn for the worse (I mean after so much video game time) that I end up taking it away for awhile. All things in moderation and such.