Yeah, I forgot to mention that; sometimes that works, I do read with my wife, and we rock climb together a lot. However, sometimes you may have your own goals (climbing training like hangboarding is impossible to do together and not fun anyway), or things the other person doesn't do (like coding).
As far as kids go however, I feel like it's almost always a trap (it can sometimes happen with adults too, but with kids it's almost a given)... I know many people with hobbies from some tech stuff to extreme sports (like skiing), who "still play with Arduino" or "still ski" after having kids. Except before they used to do some hardcode backcountry stuff, and how with kids they go to a resort, fool around on an easy run, and then go have a beer while kids are taking a lesson. Technically, they are still skiing, but realistically they are not - they are just spending time with their kids. There are exceptions, but they are few and far between imho.
Not that there's anything wrong with that, but my point still stands - when you add something, you have to lose something; I feel like for kids, it's especially true.
As far as kids go however, I feel like it's almost always a trap (it can sometimes happen with adults too, but with kids it's almost a given)... I know many people with hobbies from some tech stuff to extreme sports (like skiing), who "still play with Arduino" or "still ski" after having kids. Except before they used to do some hardcode backcountry stuff, and how with kids they go to a resort, fool around on an easy run, and then go have a beer while kids are taking a lesson. Technically, they are still skiing, but realistically they are not - they are just spending time with their kids. There are exceptions, but they are few and far between imho.
Not that there's anything wrong with that, but my point still stands - when you add something, you have to lose something; I feel like for kids, it's especially true.