This is a feature missing in all helicopters, not only Z-10 series of helicopters as far I’m aware. Though would incredibly increase their performance on air-to-air combats. I suggest creating a suggestion post as I said all helicopters are missing proper head mounted display function on their respective air-to-air missiles.
In that case some are not working properly. According to the Wiki Z-10, Z-10A and Z-10ME do have head mounted display. In that case missile slaving is a missing feature for all helicopters:
The two get used interchangeably on the forum a lot but a HMD is not HMS. Idk if there’s any direct evidence that TY-90s can be slaved to the pilots sighting system, same for Mistrals on the Eurocopter.
It’s going to be really hard to prove because the majority of modern attack helicopters have Helmet Mounted Sights for cueing the gun, simply having the system probably isn’t going to be enough for Gaijin.