Well yeah, it’s one of the most fundamental elements of Smash’s gameplay. After two games it’s clear this isn’t working out.
Having an air game at all doesn’t mean having a good air game. Even remotely competent attacks would be a step up from having four useless aerials and one extremely circumstantial one. That doesn’t make Mac unique on its own - it just makes him bad. If a character’s most defining trait is their weakness, they are practically a joke character.
Kazuya does what Mac set out to do way better. He’s ground oriented, kind of awkward in the air, but he can still fend for himself if need be. I honestly am even a bit resentful that he ended up so good under a similar philosophy and Mac still remains as helpless as he is, lol.