2 is something I haven’t experienced. I guess maybe you’re using low resolution monitors? I find Windows to be incredibly blurry or text painfully sharp.
3 is something where I think the Mac mindset is to not really use full screen windows. I personally always have part of my desktop visible and most Mac users I’ve seen in the wild seem to do the same. Probably a consequence of the drag and drop mindset (which Windows is painful to use due to it doing the opposite of MacOS when it comes to drag and drop)
Enable the file path setting in your finder options. Super easy to navigate up then.
Disk images are nice in that usually they contain a drag and drop application install process, while windows often has some messy installer that leaves a trail of shit in its wake that’s sometimes impossible to fully remove when you’re trying to uninstall the program. But… I think a zip file would do all a disk image could and make more sense to people. Sometimes I do encounter zips, though.