Let me start by saying that I know pet battles are not for everyone, and that this is kind of a niche complaint with everything else going on in Remix right now.
Given that pet battles were introduced in original MoP, I was really excited when Remix was announced. However, there’s almost nothing for battle pets in Timerunning. I had hoped that there would be a pet vendor - even if there weren’t any new battle pets, they could allow us to buy the pets that are rare drops off of raid bosses or mobs. But nope, no luck.
You can still pet battle mobs, but it doesn’t award caches, and I haven’t seen whether people have gotten any threads off of pet battles.
The quests for battle pet masters are no longer there. The masters are still there, and you can interact with them, but there’s no way to battle them. I’d be thrilled with a daily quest for each that awards a cache. Same with the Pandaren spirits you used to be able to battle.
Timeless Isle made me really sad. I had been hoping to be able to do the Celestial Tournament again; wanting Zhao was what first got me into pet battles. Maybe there would be a new recolour of each of the celestial pets, or maybe they’d add in some new pets! I would’ve even done the tournament once just for nostalgia. But just like with the other pet battle quests, you can’t do the tournament in Remix.
Again, I know this is a small, niche complaint. I’m happy to get the Astral Serpent recolour and the little yak friend. But I wish there had been more, especially since MoP was the origin of WoW pet battles.