I’m a child psychologist and deal with this stuff every day. I think everything in moderation is a good approach and perhaps you’re a bit strict. However, those saying that there are no negative impacts of screen time are unfortunately wrong - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10353947/
It’s much more complicated than any time in front of a screen is bad though. Some programmes are very high paced with lots of flashing, screen changes etc designed to constantly keep a child’s attention (cocomelon being a prime offender of this). This means that some children then struggle with more slow paced stuff, such as sitting listening to a story at school. There are slower paced programmes which don’t have this impact, eg Sesame Street has actually been shown to have a positive impact on cognitive score. However, screens in all day every day do have an impact so it’s right to limit. A rule we try and use at home is shared screens, not individual screens, so trying to watch things together where we can. I also tend to choose older programmes or things like bluey which aren’t very high paced. Trash truck on Netflix is meant to be very good for that.
It does bother me slightly that every other guideline, many parents seem to take very seriously on here, such as no weaning before 6 months. Yet guidelines around screen time are just ignored or seen as wrong, when those that work with kids will tell you that their attention and ability to play independently are worse than ever. You’ve also got individual differences - some kids will be super sensitive to even just a bit of tv whereas others can watch hours and it has no impact. I know myself that if I get drawn into tiktok or YouTube my ability to watch longer programmes gets worse and I have to force my self to read because I’m not getting the constant ‘hits’ from short video, that’s what some kids tv and YouTube does.
My kids watch tv and they’ve watched a fair bit over the holidays, I certainly wouldn’t restrict when in other peoples houses. However I’m stricter on individual screens such as games, and controversially YouTube is banned. However, we all make our own choices!