Reminds me of a pet peeve about fighters.
Lets say you spent 100 dollars on a special edition of, oh say, Dragon Ball FighterZ. Each season gets 8 dlc fighters, and there are 3 seasons. You only like a quarter of the dlc and have no interest in playing them, but you really want to maintain a competitive edge and a few are tricky and require labbing.
So you're essentially compelled to buy all the dlc simply so you can practice against them.
How is this not considered a major problem in the fgc? It effectively prices out people who can't or won't pony up the cash to buy it all.
Killer Instinct had a good thing by letting you play against all characters, including dlc.
Just seems unfair and elitist, and I'm surprised it's allowed at a serious competitive level.