Currently a big issue is the considerable delay of message readbacks at busy airports. An option to disable readbacks would alleviate this, maybe replacing them with an acknowledgement beep or screen message
Massive second on this. It’s somewhat distracting when you’re done powering through a bunch of instructions, then a plane you already gave instructions to checks in with you. For example, you cleared 4 planes to land after seeing them on radar, and once you’re done, they all check in with you to say they’re on final.