Muscial chairs is fine as long as there are enough players to fill the chairs, blizz killed off voljin without any consideration for the darkspear, they went an entire expansion without a leader! losing voljin is one thing, i can accept that (even though it was handled like shit) but the lack of any consideration for darkspear players felt really bad.
Honestly, sylvanas as warchief didnt really do much for legion, she could have had her stormhiem campaign without killing off voljin, they could have saved his death for a more impactful spot in the story. heck, his death would have been awesome at the end of the expansion or the start of the next one.
His death felt like it was only there because alliance had a lore figure die and they had to even the scales, so voljin was their sacrificial lamb to appease the alliance. he didnt even get to do anything significant as warchief, such a let down.
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I keep promoting the idea that bwonsamdi convinced sylvanas to be warchief because she would lead to helas demise which would increase his own power in the shadowlands, then when voljin finds out he destroys bwonsamdi and takes up the mantle of loa of death.
Having one horde leader as essentially the god of death and bolvar as the lich king, it would make an interesting story arc for an expansion, would go a long LONG way to make voljins death meaningful