I agree what you’re saying is a problem, but it isn’t universal. Anecdotally the trend seems to match living preferences: parents in central cities tend to be less myopic about their kids, parents in the suburbs more so.
For my wife and I, the book “Bringing Up Bebe” was really influential in how we thought about kids before and after we had them. It’s a perspective shift kind of like this: your newborn human can’t talk, can’t move, doesn’t have any hobbies, interests, or friends. Rather than bend your life around that, why not invite this child into your life, to join in your hobbies, meet your friends, etc.
That may sound silly but it’s actually a pretty influential idea to latch on to. We don’t have a schedule wrapped around our kids, or weekends wrapped around our kids. We go places we want to go, and do things we want to do, and include the kids and tell them what we’re doing and why and invite them to join the fun. The great thing about kids is they’re pretty much up for anything, so they usually love this and jump in :)
I think, as an adult, you also have to make a conscious choice to keep up your independent life.
Losing your independence is something that happens to people for various reasons - you see it sometimes when people get married, and then they withdraw from all their old social life and kind of retreat into each other. It’s a lot of pressure to be someone’s entire world... I haven’t seen many of those couples stay happy.
I think that’s the part of having kids that’s hardest. Because they do have needs and do have to be accommodated, it can be easy to just worry about taking care of them and give up on everything else because it’s not as easy as it used to be to maintain your independent life. But it’s a choice you make, and in my experience it’s deeply worthwhile.