As a self-taught person on a lot of different matters, I find myself exploring rabbit holes that expand my knowledge, but don't progress the task I originally started doing.
To your point though, I think it doesn't matter so long as you've learned to deliver business value. Application of broad and diverse skills may deliver value at a start-up for example, but wouldn't get too far at a ticket shop.
However, someone who already has the talent to be really good at something and who has the inner drive and motivation to push themselves is someone who is likely to excel. So if you find someone who is excellent at something and self taught, it's not a surprise. They probably combined natural talent with a strong work ethic, and lots of exploration of the entire search space.