In league of legends, there is a concept of "one-tricking", where you have a mastery of one champion, and use that mastery to win, rather than game knowledge and good macro play. Interestingly enough while the top ranks are full of these players, they very rarely make it into the professional scene.
To be fair, the argument most often used for OTP-ing in LoL is not that you neglect developing game knowledge and macro play in favor of mastering that one champion, it's that OPT-ing eliminates all of the random barriers to entry that comes along with having to learn a wide array of champions which in turn allows for you to spend a far greater amount of time developing general game knowledge and understanding of macro play.
I know plenty of 18-25 y/o people and I am giggling when they use the term "one-trick pony" for their narrow-minded colleagues (or bosses). I am glad they are smart and are not easily impressed. Critical thinking is important.
Personally I feel that some of the gaming lingo fits really well in the real world but it might be just me.
