Parent of a teen, one anecdote to add. You see what all your friends are doing all the time. Every gathering or event that you where not a part of you see, sometimes in real time. People hate being excluded, and this greatly amplifies this feeling. I'm certain I missed out on a ton of cool stuff as a kid, but at least I didn't have to see it.
Similar, but different. I don't let my child use social media at all, and limited to 30 mins screen time total a day. She's excluded in that all her friends use TikTok, and she can't. Maybe it's for the best. My parents used to say 'if all your friends jumped off a bridge...', and I hated it, so I haven't used that one yet. I'm trying to rely on actual merits instead of follower cliches.
I wish my parents reduced the extent to which I was exposed to recommendation algorithms at a young age.
Recently, I've become aware of how much of the time I spend on social media is not necessarily time I want to be spending there. The problem with recommendation algorithms is that they always recommend you continue watching and scrolling. When I was young, I used to read 500 page books like they were nothing, but as I've spent more time on short form entertainment, the harder it has become for me to engage in long form content like books. I still do fine in school, and I've been generally successful, but I feel like if I can't sit in silence for 30 minutes, I'm not really in control of myself. Any time I have a period of boredom or free time, it's easy to fill it with entertainment, rather than thinking on my own.
I've been trying to break these habits (or, honestly, addictions) recently, but it's really hard after years of conditioning.
I don't think modern recommendation media is completely negative, but it is built on getting people addicted, and I can see why you don't want that for your children.