I actually agree with this attitude - do what you’re good at and not what you’re bad at - but it isn’t very popular in America where “everybody can make it”. I guess it has something to do with an Eastern/Western divide in mindset, where the eastern mindset is more “know where your place/position in society is and stick with it”.
Yeah, once you start getting good at something, it’s often faster to just do it yourself. That’s how you know you’re good at something.