I would say that if have no interest in what is literally half of the internet, it does not matter how good you are at the back end, you are not an A player. T

I would say that if have no interest in what is literally half of the internet, it does not matter how good you are at the back end, you are not an A player. There are very few people who could have enough knowledge of all the domains of CS to be an 'A player' in your definition. This is about the fundamental nature of the work you do. Yes, even as a JS slinger, you still have the exact same computing fundamentals to deal with. Not sure if you are literally targeting me, but I am a backend developer who does a fair share of UI. I frankly despise JS but live with it nonetheless.