Battlegrounds are one of the only forms of content that get years (decades, even) of use, as opposed to just a few months. Way more effort should go into supporting this evergreen game mode. Think of all the maps and modes we could still be playing right now if they had spent time on that instead of… other things.
Kul Tiran druids are missing their black/green/yellow thistlehawk variants. These were available on BfA PTR and featured in promo art, but have yet to make it into the live game.