I think that Tyrande’s been the victim of bad writing more then Sylvanas really. Before Legion she spent all that time with her Hubby back getting ganked by Horde while he just stood there under “neutral” flag. During Legion she ran around like a chicken with her head cut off trying to find the lousy bum after he got caught. Now afterwards some uppity undead bouncy knife ears burned her tree down and killed a lot of her people in one of the more poorly received expansions since WoD.
I really do feel bad for Tyrande.