I grew up watching my favourite cartoons on the TV from a young age & there's nothing wrong with me, so I'm not going to stop my little boy from growing up watching his favourite things on the TV.
Do what works for you. We do screen time with bedtime milk (usually a Julia Donaldson one or bear in the big blue house). Otherwise she might get another half hour somewhere in the day, or none except bedtime. If she’s ill all bets are off. But it goes on when I say, and it goes off when I say. If she started to have tantrums about tv I would dial it back but that hasn’t happened so far (nearly 22m). That works for us and suits us. I don’t personally agree with tablets for toddlers and I’ve never handed her my phone to watch anything, except pictures/videos of herself, family or friends. So she doesn’t know that phones can play tv and I’d like to keep it that way as long as possible! We do use a portal to video call family a couple of times a week as well but I like that it’s on a shelf and not something we’re holding for video calls. I think everything in moderation and only needs to be cut back/cut out if you’re noticing negative behaviour around it/you want to avoid it entirely.
My LO is 3. We watch tv, usually at least 30 mins a day up to about 1hr 30, occasionally we watch movies or do more tv if we are ill or exhausted. I don't do cocomelon and try to keep tv close to bedtime more chilled like bluey or puffin rock. But don't do tablets or phones even for 'educational games'. I tried it and her tantrums and attitude got so bad that they are banned now. We have a tablet in the car for journeys over 2 hours with some downloaded shows on it, up to that she can just get used to looking out the window like I did when little! I really don't want to raise her to he addicted to technology or the opposite, to not enjoy tv and technology. I'm quite happy with the balance, sometimes when I'm tired I'll suggest tv and she will say no ahaha!
We did none until age 2 as per health organisations recommendations, I trust their guidelines as they have years of research to draw upon. We still keep it very limited now, 40 mins per week tops, no tablet or going on a phone. I truly believe in the benefits.
It certainly has its uses, like when you need to get something done and need to keep them occupied for a little while. We try not to overdo it and definitely try to avoid it out and about in restaurants etc. But he will have a little TV on at some point most days, films if he's poorly or if we're having a lazy day at the weekend. The only thing I really try to avoid is games on the tablet... my MIL downloaded some educational (colour and shape sorting etc, animals) game on hers and got into the habit of letting him play every time she looked after him. Whilst I can definitely see there is some benefit, he would be absolutely FOUL after it was taken off him. We've had to put our foot down and say we don't want him playing on it. She wanted to buy him his own tablet for his 3rd birthday but we've said no 😅