So now that the StarCraft post is out and confirmed no Draenei support, why exactly were Draenei as a minion type introduced this expansion?

It just seems a strange decision to introduce an entire new tribe, knowing they're weak compared to the previous expansions, while also not planning on expanding on it in the mini set. I understand the expansion necessitated a focus on Draenei, but plenty of other expansions focused on 1-2 races without introducing them as a tribe, and it's not like anyone was begging for more tribal decks. Murlocs, totems, and dragons haven't been touched outside of the occasional random card, and even death knight doesn't interact much with undead besides their cards happening to have the tag. Within the expansion itself there's already also a minor focus on elementals and demons why not just expand that to a couple other classes? Introducing another minion type knowing there's no plans to support it just seems a bit weird.