I think "digital technology" is definitely a broad term and encompasses a lot of different activities (or, ahem, inactivities) which affect our brains differently. There is everything from reading a book to mindlessly scrolling through social media sites or watching silly videos again and again and again.
One concern I have with young kids is that we differentiate between "educational" apps and non-educational apps. To me, that ends up meaning many parents justify extra screen time because something is potentially academic in nature, while ignoring that passive entertainment is still the core of most "educational" apps. And on the flip side, if you're going to be on screens I think there isn't anything inherently wrong with playing a straight up game just for the fun of it.
So far my kids are just 10 and under but we allow e-book reading and an occasional fun or educational video. That's about it on screens, mostly because screens seem to be a battleground for many families and have been for us when I open the door a little bit to them. Another huge reason though, is that I see a marked behavioral change in my kids when they spend time on screens. I see less creativity, more crankiness and more entitlement. Sure, that's a subjective observation but it's enough for me to be very cautious with young brains + screens.