During the Hightmountain allied race quest chain it seemed Blizzard made Mayla and Baine power duo work pretty well. Both of them helped each other, and it was Baine who brought Hightmountain tauren into the Horde. At some point i even thought Blizzard gonna made them the a couple.
Yet, in BFA there were no attempts on their side to at least somehow involve Mayla into Baine's character and story arc. And it was missed opportunity to develop both Mayla character and add some flavor into Baine's arc. I wonder will Blizzard involve her later, after he was prisoned.