I'm quite commonly top dps in raids due to charmed pets and I'm not afraid to use them and push the limits of them. Chanters can still really shine on a lot of raids. Yes I know charm isnt going to be usable on all of them.
They are also still one of the most powerful solo classes outside of raids too. Yeah average level and MR goes up in velious but it's still very much doable.
Maybe your raid enchanters don't charm or their raid leaders don't let them though?
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Bottom line is people are giving chanter's a bad rap in velious and you are seeing their numbers dropping because of it. But you know what. They are a whole lot more upset when there are no chanters at all.