Warwick Not being able to be disabled.

I do not understand why Warwick q prevents him from being disabled. It isn't related to his lore whatsoever and seems unnecessary. I was playing Poppy the other day and I would w every time he used it and I thought it was rediculous that that's not how his q works. I even e'd him as he used it, and it straight up cancelled my e. Seems like a pretty stupid mechanic to me.