I actually don't think it's unnecessary. I think it's perfectly reasonable to point out that there is a massive difference between teens and pre-teens. My 11 year old is still a lovely cuddly little boy who likes crafts and Lego and hanging out with me and my husband. But there was a noticeable and dramatic change in his 13 (nearly 14) year old big brother this year. Almost overnight he's grown 6 inches, his voice has broken and suddenly he only wants to be with his friends in person, or on snapchat and gaming, hanging out with his friends online. He used to love spending time with me and since this year, he doesn't really want much to do with me. I've spoken to my friends and it's the same for all of their son's too. And let's get real here, this is perfectly normal. I'm a psychologist, and this is normal detachment behaviour from a child trying to work out how to become a man who is finding his own place in the world. I think it's actually far more unusual to not be like this than to be like this and I'd worry more if my teen didn't want to push back a bit.
The issue is that for many kids, online is the only chance they get to talk to their friends these days - I know every area is different but often for kids who don't live in cities, their school isn't local, and their friends aren't local so they don't really have the opportunity to just go out and play. They game together online and talk whilst they do, and yes, they talk on snapchat and tiktok. So we could ban social media, but the problem is, are we then setting up our child to be the left-out kid who isn't on snapchat when everyone else is? He'd miss out on most of the social invites. There have been several parties and sports meet ups in his social group that have only been arranged on snapchat groups. Plus by banning it we'd have a resentful child who wants to be in the cool crowd and constantly feels stressed because he's missing out. So I think you're damned if you do and damned if you don't.
Personally I feel the answer isn't to ban phones and gaming and social media, but to make sure there is some balance (my son does play a lot of sports), that they are doing other things as well, and to have an open dialogue with your child about what is going on online.
But hey, each to their own. What works for us doesn't work for everyone, and not every school is like ours. I really respect the parents who manage to keep their kids off social media. It must be very hard work!