It's a mix. On the one hand, I do also regret not being able to crunch things through the night like I used to. On the other hand, most of that stuff matters a lot less to me now than it used to.

I mean, I still do a fair amount of hobby stuff and learning new tech stacks, but it's just one part of my identity instead of being the primary part. If I was gung-ho about wanting to start a company and never got the chance, then I might feel more regret about it. But that has never been a personal goal of mine.

I've talked to a lot of dads at my workplace about this. Everyone has these questions come up, and everyone feels closest to their children at different timescales too. E.g. some dads do not feel close to their kids as babies at all, but became very attached once they started talking.

Lots of random thoughts there. Just don't beat yourself up over it.