The main problem I have with using Scout rifles in crucible is their scopes.
Hand cannons have good range and impact, but are also great cos they don't greatly reduce your FoV when aiming, allowing them to be used at short and medium range very effectively.
Scout rifle scopes, for the most part, only work at medium range which on the maps we currently have isn't ideal.
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They're also often outclassed by auto rifles where the effective ranges overlap.
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The multi player maps are small, so the ranges are almost irrelevant.
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I wasn't going to go there, but yeah: one of the big problems with both scout rifles and pulse rifles is that most Clash, Control, and Skirmish maps make you work really hard to create encounters that reward longer-distance weapons.