Why not both? Am I missing something? You can have feedback loops and CI and all that, "good craftsmanship" or "good practices" (not "best" practices because those often suck hah), where of course opinions vary on the details of that -- and then someone who is also good at the craft who spends more or most time on helping the rest work together, i.e. manage/lead them.

I’d bet the children would come out better simply because they have parents who are likely multi-disciplined as a group. A disparite group will (almost) always come up with better results than a homogeneous one (at least in my experience)