This is what Udyr should be balanced around

Mostly around his bear stance [E]! With every new champ release/rework, more slows/CC is being added to the game. Almost every other champ has a CC or a slow, which is why a Melee AA Kit based champion is not performing well and is RIP based on op.gg stats. That's why I think it's the major problem in his Kit which is keeping him from performing well.

Put additional Tenacity or/and slow reduction in his bear stance so when combined with he might actually have a chance of gap closing / surviving teamfights.

and maybe change his Passive and give it some healing/meditation and damage reduction ability since it should fit his after temple training in the lore.

Edit: I forgot to even mention that with the release of CC's duration is extended, which makes it harder for to reach his target/locked in teamfights.