You will find that some people take up fewer things in life but do it exceptionally well. Others are all over the place and do lots of things but end up performing at a mediocre level.
The former are unable to do average work. Their DNA is such that they get nervous when they see a product or service done below par. The latter are unable to see how much better they could do if they put a little bit more effort in preparation and focus.
It is amazing what focus, prep, and going the extra mile does to your outcome!