I think what happens is some friends always require more. You cannot just type a small update. It's always got to be a dense conversation with more questions. The friends I have, I can talk to for hours at a time....that is every few weeks or every month or even more. Then I'm all yours, we can yarn for ages and phone each other back repeatedly.
But constant updating every few days when you have kids, partner,family life which often requires a longish convo, it's hard to keep that up.
There's only one friend I am happy to do that sort of thing with.
I think friendship is too rigidly defined, by many and a lot of people aren't flexible in their expectations with their friendships.
There are friends you might speak to every day - these friends might be more like kin. You might want your friend to be like this, but the feeling isn't reciprocated to the same extent.
Friends you speak to every few weeks
Friends that you check in with every few months, with absolutely no resentment and the closeness is just as strong.
Friends that are quasi acquaintances that you check in once or twice a year but will be there is a crisis and vice versa.
Friends that you mostly go out for socials with
Friends that aren't so good for going out with, but you meet up for coffee occasionally.
Friends for mostly intellectual conversations
Friends that are good for socialising with the kids in tow but not so good outside of that and you only really chat around kids and meetup with them on kiddie dates.
Friends that you dump the kids to see/aren't great with kids around
Friends that are married and you socialise more as a couple with but not outside of that
Etc etc etc.
A friend that requires more than you can give and won't accept any flexibility might be one you do not want to keep.