Yes, I’m not disagreeing with any part of that, and I’d say the exact same thing.
But that baby D.Va build was S tier. So D.Va should be S tier. Maybe just very high A tier depending on subjective opinion, but definitely near the top. That’s the whole point of a tier list.
Or just make a separate tier list that says, “this is the tier list if each character is played like steaming hot dogwater.” That would actually be pretty entertaining, now that I think about it.