Final round on snipers was nerfed specifically for trials. It was really lame and I was 100% for it. Does it really impact PvE, I don't think so.
A lot of nerfs it can be argued may not be only for trials. But trials tends to develop the meta that is carried over to the rest of crucible. Really it depends on how you look at it.
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Well final round on snipers making them able to 1 shot body shot was quite frankly broken so that's reasonable.