Not entirely sure how I'd organize my 'wishlist' per se, there are more 'casual' aspects I could touch on such on characters, soundtrack, easter eggs and the overall presentation of the game but they're probably all set in stone by now.
So on a competitive scale, regarding things that I think would be geuninely productive for the game, I guess I can post whatever springs to mind.
1) more varied levels of punishment.
Some people may not know what I mean by this so I'll elaborate a bit more than the others. Currently the line between moves in NRS games either being completely safe on block or full combo punishable on block is very thin with few exceptions, and this has been a concern of mine all the way back to MK9. An example of this is Alien's OH flip in MKX, pre-patch a lot of characters couldn't punish it at all, which shouldn't have been the case, but making it 3 frames more negative meant almost everyone could punish it for over 30% with no resources necessary, which put the risk reward of his setplay well out of his favour.
In my absence from here I've been playing Tekken 7, and Tekken games generally handle this very reasonably by giving "jab punishers" at 10f, magic 4 kicks at 11f, knockdown punishers between 12-14f and launchers at 15f (there are some characters who's launchers are faster or slower than than 15f, but are compromised/compensated in other areas of their game)
Now NRS are probably too far into MK11's development to follow this system, and I wouldn't necessarily want them to 'Tekkenize' the game, but if some moves at least required some kind of resources before being able to get more juice out of them, it would conversely make opposing moves easier to balance.
2) Moves that have some kind of 'properties' such as crushing, armour, invincibility, aren't inherently bad, but they probably shouldn't be active as of frame 1 of said moves.
3) Variations can stay, I've already expressed in other threads that I think they should, the main concern is ensuring one variation is effected by balance changes to default/shared moves aimed towards a different variation.
4) Armoured moves, I'm personally impartial as to whether they launch or not, (more so that they're on a relatively even playing field across the cast) but this kind of thing needs to be decided before the game is released instead of forcing moves to do things that they're not inherently designed for, ruining other aspects of a moves' utility or letting other characters bend the rules with this, as we saw in the final patch of MKX.
5) Mobility options - some people have called for MK9 dash blocking to return, others don't want it to on the basis that it "looks weird". Wavedashing in Tekken isn't exactly the most aesthetically correct thing either yet has never gone away. As long as there's good upfront mobility and it's tied to some kind of restrictions (which is essentially what running was in MKX no?) then I don't really care what it looks like.
6) 1 bar block breakers - this is more of a hot take/rant than a request.
Seriously, if you're asking for this, stop it. As the name suggests, it's simply a breaker you can use on block. The only reason people do ask for this is because of pushblock in Injustice, where the entire meter system is governed drastically differently. Should clashes and wagers therefore also be in MK11 in the place of regular breakers? No? Didn't think so.
7) Above all else, can we not suddenly put the game on the back seat after 2 years, and keep going until a sequel is released, like, you know, every other community in the FGC does?