I agree with @pinkcow123in that it’s easier to start strict and then relax the rules (imposing limits where there have been few/none previously is always going to be challenging). I have certainly taken that approach with my two (still little at 4 and 2) - I’ve started very strict and intend to slowly relax the rules as they age. That way I am in control and can curate screen access as I think best. I don’t think screens in themselves are ‘bad’, but I do feel there needs to be age appropriate oversight and restrictions otherwise they can cause damage. And limiting it when they’re young helps them to develop other skills - my 2 will happily play independently for long periods in the house as they’ve never been allowed to watch TV endlessly, but instead have been told to find ways to occupy themselves - like anything, it is a learnt skill and you have to give them ways to learn (learn to play, learn to cope with boredom, learn to self-occupy etc).
Currently, we don’t have tablets at all, and I limit TV to 30 minutes a day before their dinner. But I choose what they watch, as I think it’s as much about content than actual time. They have a list of ‘pre-approved’ options they can chose from (as mine are still very little, they can have either an episode of Mr Tumble, In the Night Garden, a Julia Donaldson adaptation, teletubbies, alphablocks or number blocks, or Hey Duggee - so they do have a lot of options, as between that lot there’s hundreds of episodes, but it controls the actual main content).
Some may think I need to unclench, but I believe as the parent, I need to control screens as much as I control their food, their bedtimes, their general health and wellbeing. Access to technology is part of their development, and therefore needs to be considered and managed much like all other aspects. Others can disagree, but it works for us