I don't know about Mass Effect 3, haven't watched runs of it. If cutscenes are forced and maybe lengthy, I get why you'd allow mods to specifically skip them. They're uninteresting (for the sake of the run) and everyone loses the same amount of time. If there were tech that allows you to skip cutscenes, say by routing around a trigger OOB, then I think the mod probably shouldn't' be allowed as it's now skill based. But in the end, the community for a game decides. And they're also free to allow a category with auto skipping cutscenes and another one with the full cutscenes. So then it's the runners choice.