Grapple is even more common than it was before, this allows an easy escape from one.Sure, you can do that to your heart's content, but what's the use case benefit there? Ranged allies should really be more than 30 ft away from you and probably don't want to be that close to melee anyways. Melee allies should mostly already be engaged with their target.
Maybe occasionally at the start of battle if you go before a slower melee character you can teleport one 30ft forward to help him close the gap, but that's fairly situational as well.
Easy spirit guardians abuse, if you're into that (either by teleporting an enemy or teleporting the cleric)
Teleport positioning is just big. Especially unlimited and by tier 2.
The point is it's consistently good abilities all tiers.Like maybe if you could teleport someone anywhere within 30ft I could come up with better use cases.
But as it stands the only consistent Use Case I see is to help you tank - which is cool, i like tanking, but getting a good tank ability isn't tier S.
Teleporting to the Barbarian takes away most of the benefits of traditional teleporting. Misty step can be used in exploration to get places you otherwise couldn't or to really kite enemies in combat. This can't.
I'm not saying any of the abilities are bad. You've not got to sale me on this being a good subclass. But it being good, doesn't mean it's tier S.
I have no problem with that, but @Zardnaar is supposed to be giving the higher level subclass abilities little weight due to rarely being played, so even if it's the best level 14 subclass ability for Barbarian, his weights shouldn't mean that ability has much impact on the rankings.
I'd pit Zealot or Berserker against it.
The berserker is very close, and better for damage. But it doesn't have the full barbarian AND really good party support angle. In my opinion, that gives the world tree the edge.
The zealot is less close. It's fine but, especially if we're ranking higher level abilities less, it's set of abilities isn't as good, again IMO.