I think I would like to put my ten cents in on this. I have used SketchUp Pro since version 5. I have used it on both Windows and Mac. Windows always used to crash when my models got to be too big and Mac has been super stable for me and a workhorse. I also have to use AutoCAD products in my day to day work. If you can look at the latest versions of AutoCAD they have pallettes that dock. They can be moved all over the screen and onto multiple creeps. They can be ‘hidden or collapsed and then they expand when your cursor goes over them and they can be locked and unlocked.
Maybe this is something we should be looking at in how to advance the cause and move SketchUp forward.screen space to me is valuable even with a 27” and 24’ SET OF 5K Apple Monitors running off a Mac Pro or my MacBook Pro.