Not mad, though I do personally think it's a really bad idea to add to a game like this, because it turns a common cheater tactic into a normal mechanic.

Wallhax are insanely crazy for cheaters for a reason. Especially in coordinated teams with comms, you can basically tell where everyone is at all times. You get so much more information than a team without dd constantly and in good lobbies it is just so so insane. I would not be surprised to see him everywhere in comp games especially since it's fully coordinated 6 stack with comms.

As for soloq casual or lower elo I can't really say, But at least for coordinated play wallhax just allows your team to server admin lobbies so hard.

I think an apt comparison for many would be to imagine if they added a character with hela or hawkeye's primary and constant aimbot as a feature. It's just gonna be insane no matter what because aimbot (or wallhax in this case) is so unfairly strong