Overall I'd say it's pretty hard to stay conservative about exposing them to screens. They're all over the place now, if I don't give them one they'll want mine. Plus their friends see them everywhere, too. I'm trying to at least steer the screen time towards useful things like math and coding, but it's not always easy.
I have this scary feeling that how you spent your screen time as a kid of this generation (current children) is going to be one of the major determinants of your life. You can use the relatively new power of having all the world's knowledge at your fingertips, or you can use your time looking at cat pictures. The difference is going to magnify the natural differences that occured in previous generations, as the kids who want to learn about stuff can teach themselves while there's never been a better way to waste time for kids who are inclined that way.