I find issues with screen time to be an interesting paradox, because at an earlier time before the ubiquity of screens, there were many that always had their nose in a book, or some other sort of hobby that garnered just as much if not more than tech time of now, but doesn't garner the same type of ire.
I used to take it for face value, especially from a heteronormative perspective, that often times women felt lacking in attention from men that were always watching their TVs and phones, but I noticed the sentiment is not negative when equivalent or more time was occupied by a hobby like reading, or ship building, or car stuff. I think there's a pervasive idea that somehow the fulfillment garnered from screens rivals that of a partner in a way other hobbies don't, so similarly to the modern trope of women not being happy to see their man's happiness not derived from her in some way..screens seem to be considered a cheat, or a shortcut for fulfillment that should be earned from a partner.
I also think it is easier and more convenient to question why a partner diverts so much attention towards screens, than to look inwards and perhaps take accountability for not being a bigger diversion...again from a gendered perspective, I know most men that complain about their wives/gfs obsession with social media are 1st tasked with making sure they're providing the emotional attention and support she seems instead of critiquing how she gets what is "lacking" in the relationship.
I also know from the perspective of a partner that thought their partner was too into a specific social media, that me making the effort indulge myself from time to time in whatever zeitgeist was going on over there meant she would make it a point, and the effort to involve me into her screen time.