Let me offer a different perspective.

Specialization brought a lot of modern "disease", be it social or actual health diseases. The best example this can be seen is our movement. We used to be able to do everything to an extent. climb, run, squat to pick berries, crouch, etc. And we were very healthy because of this generalist approach. Now, we have professional athletes that specialize. Let's take an ultra-marathon runner as an example. If he is one of the best, he specializes so it is safe to say (with current general knowledge people train by - that is actually not the best approach ) that most things he does are related to endurance running. So he will not be that great and quick jumps, or springing, or lifting heavy objects. In fact, he would probably be shit at those things.
Now, he is one of the best so he gets lots of resources (AKA Money). But he sacrifices the fact that all he does is one thing and therefore limits his human experience to that one thing.
On top of that, he's ruining his health as all he does is one type of movement which puts constant and same pressure on his joints and the body. Any repeated motion over long period of time is just deterring to the body.

I could go more into this and bring in also "tribe psychology", etc. but I think this will serve at least as one example.

Though I am not saying that specialization is EVIL. But we should ask ourselves, do we want to?

Do we want to do just one thing in our life and limit our human experience to that? Do we reallly need to be the best?

Even from economical perspective if people were actually in reality buying just from the best people/sources, the economy wouldn't actually work.

Also, as promised, here's an article I said I'd write and link you.
Traveler Trying To Fit Back In How Do You Meet New People And Make Make New Friends Efficiently Without Much Of An Effort --- by @joewantsfreedom