Or because they suspect you may let them down, first you control the variables then you make success more likely.
If you don't fit the trope, you may act in ways they don't expect or desire; thereby increase the likelihood of a wipe
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I'm more skeptical of the person who relies on a single weapon to achieve success. Let's not forget, everyone completed their first Raid without it. I get the desire to want to control variables to provide the best outcome, but I find it petty if they absolutely REFUSE to accept any deviance. At least give the dude a shot, if he's not cutting it, find someone else, but don't exclude someone for an arbitrary requirement.