The answer is simple; Not all fighting games are created equal. They aren't made by the same people, they aren't all made with the same goals in mind. They don't all have the same quality graphics, sound, story, characters, etc. Why would they automatically have the same quality netcode? NRS is good at that other stuff, unfortunately they suck at this.I'm starting to think that whoever runs the online for Killer Instinct is a magic man from mars.
Did the developers for each video game play duck duck goose to decide what team they got to do their netcode? I mean why does Killer Instinct, a less popular game, have flawless netcode, while NRS has had terrible netplay for 3 games?
KI (and others) was built from day one to have unflappable netcode. Literally, day one. They compromised everything else to do that one feature right. That is a compromise NRS (or more likely WB) is yet to sanction.