Speaking of costumes, I think a key area it falls short in this game is that each character really only has 5-6 costumes, many of which look VERY similar or are just the same thing as another costume with more or fewer accessories. A perfect example here is Kabal: he has revenant full armor, revenant no sleeves, wife beater human, winter human, burned human, and burned human with no sleeves. Each individual costume is technically different, but they're really all just set on a single scale of fully revenant to lax human. In contrast, every single character's available costumes in MKX are drastically different in just about every way.
I feel that the core sources of this issue are 1: the the fact that character skins are so damn samey and 2: the unlock system including every color combination as a separate "costume." With every costume style having 10+ color combos, that limits NRS' design space for more overall costume styles due to development time. I believe that a single step further would have been PERFECT: it's clear they set primary, secondary, tertiary, complementary, etc. identities to each part of each gear / costume. If they had gone further with this idea and had 4-5 general color palettes that could be applied to any costume as unlocks per character, this likely could have opened up more room for costume styles. More costume styles would mean more opportunities for throwbacks and reimaginings of MK9/MKX (or even earlier) games. For example, I would straight up murder a bitch to have base MKX Kitana skin in this game.
This would also make an easier time for appeasing all character playerbases with the Kombat League skins. Instead of individual characters getting skins, they could reward 3-4 of the League's color palette(s) to be applied to any costume of one's choice.
Thanks for coming to my TED Talk.