Earlier quoted context omitted.
> it is almost an unusably bad experience to simply browse the web and move files around Cannot relate at all. "Move files around" is essentially the same on Windows and Mac, except on the Mac I have a UNIX shell. Browsers also behave exactly the same on every platform, and Safari is snappy and the least memory-hungry of all. What is it about?
Have you ever needed to perform a reliable recursive directory copy between two drives on Windows? I have and it turned out to be a comically complicated task. Robocopy helps but als has its edge cases you need to handle. Also long path names become problematic (MAX_PATH etc).
Linux can have issues here too though, depending on the file manager being used. Some file managers there still have weirdly bad copy/move handling.