I can't even begin to tear apart your post without feeling bad for you. But, because it's fun, let's start.
MK f-air? Do you ever see an MK space with f-air? Give me replays, please fine one of a good MK that spaces with f-air.
What's he going to approach with? Specials? Grabs? lol?
F-tilt is a much better option than f-air. (For that matter, f-tilt outright beats f-air in the MK ditto as far as spacing goes.) D-tilt works wonders too. He has so many options that for you to even consider f-air over nado/d-tilt/f-tilt/d-air makes you sound like a really really bad player. For you to completely neglect MK's dash speed, and therefore his ability to walk to mid range and punish OoS with dash attack and "grab" tells me you don't know squat. Nearly every character has an answer to rising f-air. It's not MK's best approach. Tell me, what MKs have YOU been playing? Maybe the MK players are
punishing your open playstyle with f-air. And
punishing with an unsafe move is completely different than
approaching with safe pokes that MK has.
MK n-air? Do you ever see MK n-air as an approach? It's a great follow-up and good for reading spot dodges. It's great for abusing invincibility frames off the ledge and ledge-guarding. As an approach? N-air in MK dittos get's punished by n-air (laughably), and it completely ruins MK's frame and range advantage if you just run up to n-air any character's shield.
"First z-air does not win." This is open to interpretation. First z-air that lands? Because it's better to simply outspace your opponent. Meaning you let them commit to z-airing first. First z-air to be shot out does not win.
As for anything else, I have people like you who like to post as if they know something so I can procrastinate from work and tear apart their ignorance.
I apologize if I do not actively advertisement how good I am through replays. Or have a 4,000+ post count and therefore presume I'm good. But I cannot apologize for people like you who post ****ty and false information and therefore mislead people on how MUs are played.
Please please please attempt to continue this argument with your stupidity so I can really show how bad of a player you are. You think this is arrogance? I think this is me telling you to be a better player and think before you post. I don't care if you walk away from this argument either, disliking me and thinking I'm an *******. As long as you walk away realizing "Holy ****, I'm wrong and got called out on it. Maybe I need to take a step back and analyze the subject before posting like I know it."