Indeed. Tyrande's poor characterization is a symptom over the terrible writing around NEs ever since vanilla WoW, not a cause. They just get shafted over and over, either to show how the Horde is so cool and evil when they beat them, or to show how wise beyond their years and full of potential the humans are when they school them.
They should never have joined the Alliance in the first place, but muh two faction prides ensured that every race has to fit into the red or blue blob, and most of the times that means kowtowing to the edicts, customs and mentalities of humans or orcs.