I don't know about how it actually is, but I don't think I see many Beast Tamers grinding around. So I think it might be a big boost to Beast Tamer's skills to make more people play that class.
But then again, GMS is trying to be more like KMS (nerfing kishin and possibly removing it in the future), KMS doesn't have Beast Tamer either. So it might still be a nerf, just because its Nexon.
I know some fellow beast tamer mains but yea we're a pretty small community who actually mains it.