The problem with Voli and Udyr is that their kits are, from a game design perspective, toxic. There are only two possibile interactions between another champion and their kits. The first is that you stay far away enough and neither of them can do anything to you because you're out of range. The other is that you get super fucked up by their kits when you're in their range (assuming they were strong or fed). Even champions like Darius have counterplay and outplay potential. You can make sure you don't get hit by the blade of his Q to ensure he gets practically nothing out of landing it on you.
These champions that only have these binary interactions with other champions are the worst part of the game, and it's the biggest pain point when arguing for buffs to champions of this nature that are weak. I 100% have no clue why they are suddenly deciding to give Volibear a new lore identity with Ornn's release when a VGU is nowhere even in sight for him. They're picking NOW to do that, when Swain, Evelyn, apparently Xin Zhao, are all ahead of him on the list?