I only need five things:
1. Better quality midi samples than those we currently have in game. Even free online sequencers out there have them. Come on, squenix!
2. Ability to play more than one note at a time at high bpm. Well, you can do that somehow by pressing 2-3 keys almost simultaneously with a really short delay, but simulating a guitar strumming of a fast-paced song, for example, makes a cacophony (or should I say an ear torture?).
3.More octaves. Even Mordhau, an indie croudfunded medieval slasher game about swordfighting with daily online peaking at 1.5k players is giving players five octaves for their lutes and shawms instead of our pathetic three. Should I say that lute also sounds much better there?
4. Proper drum set as a single standalone instrument instead of a snare, bass and cymbals being divided into 3 separate ones. Just look how BDO implemented it. Real life drum music sheets never contain 37 variations of a bass drum. It's always just a bass drum mixed with other drums and cymbals. Period. Leave 37 buttons for bongos, but give us a godsforsaken drum kit already with bass, snare, toms, open and closed hi-hat, china, crash, ride, splash, cowbell and so on!
5. Bass guitar with different modes, like the strat we already have in game. And with the slap mode of course. Again, even absolutely free to use online sequencers have it. Make it another Fender collab, I don't care. Double bass simply doesn't suffice.

Without all of that I already lost interest in performing and writing music for FFXIV. It just takes too much effort to make something that sounds good. Looking how other games managed performance much, much better also demotivates and makes me leaning into playing those projects instead of renewing my subscription. It's just one less reason to keep on playing for months between major patches without devs actively making content for us in that period. We could've generated our own content instead, if we were less limited.