As revealed by the code of a recently released Alpha test build, MIUI 15 will include two useful features. The first one is a more powerful and flexible clipboard, and the second will give the users a capability reserved to third-party apps so far, namely the ability to pump up the volume by 200%.https://www.notebookcheck.net/Two-new-MIUI-15-features-leak-online.734876.0.html
The only possible improvement to MIUI of any version would be to remove it completely. It is a total, intrusive and slow pain in the arse. I would never buy a Xaomi again for this reason.
Unfortunately, I have to agree with you. Not going back to Xiaomi after the amazing Mi A1 from all points for view and the both amazing (hardware-wise) and awful (from the software perspective) Mi 10T Pro. Anyway, I think I will get some custom ROM for the Mi 10T Pro after I receive MIUI 14 and discover there's nothing actually worth it coming with the update.