I am not talking about specializing I am talking about mastering. Thats a very different thing.

You can specialize in playing a sweeping technique on your guitar that does not make you a good musician.

And again. No I simply don't believe you gain breadth by being exposed to many different things. It's the other way around. Learning a lot of different things superficially is not going to teach you the real lessons.

It's not about acquiring a specific set of skills it's about acquiring an ability to learn how to learn.