If I think back to my mid-90s teen years, I came home, watched CBBC/ CITV, then Neighbours (so zoned out until 6pm). One evening a week I did a physical activity. I was an avid reader and I enjoyed drawing. I lived out of catchment and didn't socialise casually until 6th form. I was fairly early in having a computer (386 so very slow and low powered) and used applications like paintbrush, and played games like Minesweeper and Solitaire. As I got a more sophisticated computer, I played games like Sim City and Settlers. I didn't live with internet access until my early 20s.
Looking at my DCs, they do more activities and physical activities than I did and have something most days across the week. I get them out doing things like walking, cycling or swimming more.
Dyslexia and migraines aren't conducive to creating a love of reading for pleasure. They also have hypermobile hands so struggle with drawing for prolonged periods. DS1 enjoys Warhammer, but that had to be paced due to the cost.
Not all screen time is equal. DS1 tends to watch more educational content akin to me browsing Encarta on CD rom. DS2, alas is in a skibbidi toilet phase 🙄
DS2 does maintain more social contact with his friends from other neighbourhoods than I could over a landline.
I view it not so much as a quantity question as quality, and what are they missing out on by using screens vs what they do in their offline life. There is also the potential issue of online bullying and ease of undesirables getting in contact.
Yes, my two use screens a lot, but actually their habits aren't way off where mine were at 30 years ago.
There is also less teen-centric TV. As mine are getting older they are picking up interest in series like Race Across the World or Gladiators, but from 8-11 there wasn't much family friendly TV that we found of interest to us.
Unfortunately I can't magic up my children finding reading easy and fun (believe me, I've tried all reluctant reader tips), autistic DS1 suddenly having social motivation or DS2 having friends local enough to see casually.