One thing that I've learned from my friends in the last 10 years:
You can either have deep friendships XOR children.
All of them are either still without children, or are by no means valuable friends anymore.
Sorry, but that's just how it is.
If it helps, I've found hosting a pizza night to be a really easy way to have some good hang time with friends. I make the pizza and it's good enough to be free dinner for them. The kids get to participate by customizing their pies. We all catch up for an hour or two in the kitchen, watching me scramble and make a mess. If somebody brings over a bottle of wine, even better.
Parents want to hang out with other parents.
Hang in there. As the kids get older, "XOR" can turn into "WITH".
Parents by necessity need to prioritize their kid. Hard to relate when you're single. So I understand why parents seek out other parents; they have a common talking point built in for an icebreaker.
At the same time, that very much is cultural. We think we need to raise children alone, and that's very much not the case in many societies. Good friends (even single) would be part of the family and help out with looking after or playing with the kids. Basically an uncle/aunt.
Disappointing somebody has seen fit to "drive-by" downvote your post that simply describes your truthful personal observations.
Presumably they don't want to engage in discussion, which is precisely what this topic is about!
For me, kids have had a “filtering” effect. Where previously I had a lot of friends (including shallow ones), having less time and being less flexible in general compressed my circle of friends to just a few people with whom I share both a deeper connection and a mutual understanding that the pressures of life sometimes get between us, and that’s ok. And as another commenter mentioned, kids do grow older…