> You seem to be incorrectly applying this article as advice on self development and then making an argument against that.

From the article:

> In our personal lives, it would help to focus on being that person in the community who could be depended on for a particular task/skillset required for a task. [...] Focussing will ensure that you are not distracted and the increases likelihood of you doing a good job.

I think the whole article is supposed to be more general life advice, not just career advice.

> They are suggesting that this is a good strategy to become the best at something

If this is the case then the advice is absolutely trivial. More so, it doesn't address the question of what it means to be the 'best' at something.