Finkel posted recently that PWs are the issue, I go with that to be honest.
They are an issue even when they are well designed, because they print no strong hate other than creatures. Nobody ever got punished for running walkers, that is an issue. Everyone gets punished for something, bar walkers. I get punished when answers don't match up or if my opponent Moons the board and I failed to run basics, but not because I included a set of Teferi or Jace.
I don't want ****ing combat in every match of Mtg. I just don't. It is called variety, and variety is Mtg's strength, gradually being whittled away.
Everything should have a predator. That is why Legacy is great, you can hit everything. Lands, hands, spells, Enchantments, critters. The whole lot. And you can draw smallpox against manaless dredge.
There are no predators for walkers bar suppression field and needle effects. Other than that it is one for one, with them always getting to use it, or one for one discard/counter if you exclude Nevermore effects.