During the recent Steam sale I picked up KSP2 and ultimately refunded it. Aside from the bug I already reported (and one or two more I should ensure are reported), here's a few changes that I think would resolve some of the problems I had:
1. Make the VAB's default scroll wheel action up-down instead of in-out again. KSP 1 had it so the scroll wheel in the VAB moved the window up-down the height of the rocket and ctrl+scroll zoomed. Since most of the time spent building rockets is going up and down them, returning to this behavior would be preferred. Or at the very least, give me an option that isn't middle-click+drag. Given the size of rockets and the slow rate of movement I experienced, that was supremely annoying to try to navigate even a modest rocket.
2. Group parts by the sizes they go with, not the size they are. When I went to get the equivalent of the Mk 16 parachute and had filtered by size, I couldn't find it because it was in a different size category than the capsule(s) it went with. Really quite unintuitive for finding related parts.
3. Bring back Part Action Windows. Managing the PAM was more time consuming than it should have been.
4. Allow the navball to be centered. Some of us fly by the attitude indicators and sticking the navball in the corner is a recipe for neck stiffness or missing what's going on in the center of the screen, especially for people using ultrawide monitors. This is actually something I realized would be an improvement after I played KSP1 again.