All for one, or some for all?!?

I was just thinking about whether it's better to spread yourself over a few different things, and get generally skilled in a few areas (such as some different sports, writing, musical instruments), and how this would contribute differently to your development than being focussed in one or two areas (like getting really good at one instrument or one sport). I think it's better for kids to try out different things when they're younger, because even if they aren't focussed on something until their 11 or 12, they still have the opportunity to make something their main focus and become the best they can be. Thinking of this makes me think about the example of playing violin, because I believe that there is little or no difference between kids who start when they're 6 or 7 and kids who start at 10 or 11, by the time they reach about 13-14 years, all other things being equal. As far as other things go, like hockey, I think it's likely beneficial to start skating earlier, but I would gather that kids who focus mostly on hockey from a young age, and those who have it as a small part of their life along with other hobbies/interest/past times would not differ significantly in ability so much that a child could not start focussing on hockey around the age of 12 or so, and catch up to those who have been more involved...
I guess the more technically challenging something is, the less likely being involved at a very young age is likely to make a difference, as the younger children with probably not become very proficient, even with a few years practice.
Okay, this train of thought has run out of steam, as it's getting late-ish and I'm tired-ish. Anyone have it one way or the other and want to comment, go ahead ...
Good night, and God Bless.
or alternatively:
Sleep well, and wake happy.