Actually, I do want those otherwise competent people moving away from scientific fields due to their personal superstitious beliefs. Note the caveat on competency. Note also, that the entire aim of science is to avoid superstition.
As far as I know, science does avoid superstition regardless of who is involved. How many theist-published credible peer reviewed papers out there are based on even the tiniest bit of superstition?
Naturally, simply because a belief may interfere with a particular pursuit it does not follow that it will do so. Nonetheless, it behooves the rational mind to eliminate as many variables as possible.
I would think incompetence, or a lack of supply, would be a much higher priority to eliminate than a few theists who are "otherwise" competent. How big of a variable are they, really? The entire process is meant to weed out poor science whether it's by a theist or an atheist.