I don't think your mental health would survive thinking that the baby itself is the hobby. The thing with babies is that they're draining. They scream for hours on end and there's literally nothing you can do about it, which makes you feel utterly hopeless. On top of that, they prevent you from doing even basic things, like eat and sleep. So you're sleep deprived and angry and hopeless, which is a miserable combination.
Which I know sounds like a fun challenge on paper, but there's a reason most people fail special forces tests. So ultimately it's about finding a counter-balance to that.
What I've found at least, is that the "hacky" side of raising a newborn is trying to find ways to optimise your life in order to reclaim your old life back. In particular, trying to figure out how to get enough sleep whilst still maintaining the house etc.
Of course, these are all just words at this point to you. When you're thrust into it, you'll quickly adapt and figure out a way-of-life that works for you. But yeah, would be interested to hear back from your experience, I too started out quite optimistic about the whole experience, which then all went out the window when actually faced with the challenge.