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.
My kids are <10 and they have youtube limits, but they can play heaps of interactive games where they learn about resource management, team play, how systems work, how to solve problems and how to think.
I will even let them back on the computer in the evening after dinner if they want to do programming or level editing in Roblox, or make music in garage band, or something else creative.
I want for my child to have a bigger playground, so to speak. Reading books, playing with kids outside, bothering our neighbors constantly to pet and play with their dogs, making dandelion necklaces, etc. When she's on her phone she just zombies out, and it's like watching a device suck the soul from such a warm and extroverted person.
Things will change with time, but for now, I want her to appreciate and enjoy being a kid. The time for 8 hour screen days can wait.
Perhaps one differences is my kids don't have phones at all. No social media. My kids screens are tools for creativity and interactivity. PC's. There is not much zombie face.
Update: Oh also, its very social. After the home schooling in the lockdown, the kids have all their school friends in discord and google chat. There is lots of chatting and laughing and the occasional augment. (which is all part of learning)
With all kindness, this is a bit defeatist. True, chances are they'll spend most of their lives sitting in front of a screen. That's no excuse to skip exercising and neglect physical form. Likewise, they need to develop healthy screen habits, which is stay as far away as humanly possible from screens, or else be devoured by them.
I think the screen vs. no screen debate misses another important point: what am I doing while they're watching something or interacting with a screen? Kids certainly need their own play time and autonomy. But what I don't like about screen time for my kids is the easy excuse it gives me to not pay attention to them.
So, no judgement on the screen vs. no screen from me. That 30 minutes from the TV can my time to zone out too. But it can also be, instead, 30 minutes during which I teach them something/play with them/etc. rather than let the screen take over.
Much of what you said can be done outside the screen too, if in alternative forms.
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.
I should have been more clear and said 'phone time', literally, because it's a Google Family Link phone limit. She's allowed to use a chromebook to do homework when needed, which honestly isn't often at this age. Honestly, computers don't seem to interest her much, yet.