See, that's because devourer is 100% stupid on each and every one of those examples. Tiger stance Udyr was gone the moment Sated became a thing, and as much as Voli likes having HP being able to bite after the flip and air hit while his ult is shredding your entire team 50% faster than before is stupid. Phantom hit was a great thought with horrible implications that apparently weren't thought through enough. It's insane on every jungler from Vi to Kayle to Xin and everyone in between except like, Shaco, maybe Skarner, Evelynn, Fiddlesticks? Does Mundo even go jungle anymore? Like 3/4 of the "good" junglers either take Devourer or Cinderhulk, then become assassin-esque or unkillable respectively. Not to mention most of the good Devourer jungles are naturally tanks because for some reason they got on hits in their kit, and the rest are either bot (Vayne/Tristana/Kalista) or top (Gnar, Irelia, Fizz...).
Basically the issue is not so much tanks, but rather that a lot of tanks jungle now because Gnar and the new Fiora exist and they wreck melee tanks, and most of said tanks have good on hit effects that get even stronger when they happen 50% more in the same time frame. The issue is devourer for the most part, and then right behind that is the juggernaut reworks being obnoxious to play against because they are tanky as hell with either massive nukes or crazy levels of DPS/CC.