[MX Master 3] First of all it feels a huge improvement, especially being able to customize point&scroll behavior per application, this greatly increases comfort and usability. Also very welcomed that the VS Code thumb wheel horizontal scroll is now fixed, this was as may stupid it sounds, but one of the biggest issues the fancy mouse lover dev community had for a long time :)
As for feature, an idea would be to implement the pinch-zoom behavior, similar to when you zoom in Chrome with your touchpad. Imho this is what "zooming" should be, and not just he default zoom bowsers have by default. I use this a lot from my laptop, but being able to do the same with the mouse on a desktop without touchpad I think would be great stuff.