Amazing Ampharos
I'm a lot more inclined to take away the character angle out of "doing your best" these days, that's just my perspective. We're competing at an extremely skewed corner of Smash possibilities and the player on the day shouldn't blame their lack of character choice on their weakened ability to compete with success.
Ideological differences at it's core. My region has a "close" top layer of players who get similar results at every event with mixed characters (as in, still above those a level below), similar things are seen in regions in which I have personal contact with. I promote player independence from characters, especially in a game where the balance of the cast are close and skill floors for most of the cast are stable and mostly overlap.
Why? Because we have balance patches, things change. When something changes with no intent or logic, I consider it off the mark from what players are having to deal with between patches as it is. Diddy could've been practically deleted by making all his damage values 1%. I prefer thinking the responsibility for adapting is onto the Diddy player to do something different for a tournament or two, not the rest of the scene.
Now inb4 this is reversed on me to prove their point, but be wary that's exactly the difference in ideology.
It was definitely banned... almost instantly. It was an issue because it was hard to tell if people abused it "secretly" in the moment, but in hindsight player's have been caught out abusing it.