Still not sure I agree in this case (you can think luck is real bit still behave optimally) but it could be a helpful way to think in other scenarios.
Believing luck is not real pretty much immediately activates the just world hypothesis, which is responsible for some rather awful things happening to people. It's the kind of shallowly selfish, short-term belief set we do not want to have.
It's not just about a given person and how productive they singularly happen to be, why are we focusing on that so much?
This doesn't follow, and the article adnzzzzZ linked explains how it doesn't follow. In particular, if you divide the concept of truth up into "objective truth" and "pragmatic truth" as the article suggests, you can believe the just-world hypothesis is false on an objective level while still believing that you should ignore luck on a pragmatic level, because it - by definition - holds no bearing on what you can control.
Once you get into any specific situation and you need a higher resolution view of things then you can look at the situation as it should be looked rather than defaulting to the low resolution view that luck doesn't matter.
We can all put our big boy pants on, accept that luck is a part of reality, and act in the best possible way with this fact in consideration.
