Something being difficult to deal with doesn't make it "bullshit", that is scrub logic. You have to take all his options into account.
Both empty canceling and GB canceling his shoulder are essential to his game. When you see Warden's shoulder charge startup, you have very easy options to beat it or completely avoid it. You can either light attack him, beating both the shoulder and the shoulder GB cancel (I believe Raider is the only char without this option), you can properly space him out, or you can roll away avoiding all of it. The problem is players see the shoulder charge start up and they try to left/right dodge it so they can get a punish if he follows through and whiffs. But Warden can cancel the shoulder into GB and since dashes are GB punishable, they get guardbroken.
The argument then is "but he can empty cancel and block my attack or keep forcing me to roll away". Yes, he can empty cancel and block, but to block a light after canceling he has to guess which side you'll attack from. It's not guaranteed he will block and since it's also a light, unless you're super predictable you're not ever getting parried.
You can easily limit Warden's options if you actually study the matchup instead of crying for an unneeded nerf. This is and will continue to be the problem with For Honor. There's legitimate problems that need to be addressed but instead they listen to the masses of scrubs who refuse to actually learn matchups. Warden is pretty easy to use so naturally he gets a lot of complaints. That doesn't make them justified at all.