We value “T-shaped” people.
That is, people who are both generalists (highly skilled at
a broad set of valuable things—the top of the T) and also experts (among the best in their field within a narrow discipline -- the vertical leg of the T).
This is a nice metaphor. I try to be T-shaped, but I wonder how useful I am becoming... My expertise in high-precision mass spectrometry is not something companies are looking for....
I feel that to be "among the best in their field within a narrow discipline" (the vertical leg) means you have a natural disposition and interest in that discipline. Not something you can just choose (that would be more about the horizontal).
Then the "where are you willing to work?" becomes an important factor. There aren't a lot of "high-precision mass spectrometry" work in a lot of towns.
This is a nice metaphor. I try to be T-shaped, but I wonder how useful I am becoming... My expertise in high-precision mass spectrometry is not something companies are looking for....