> I am old, but I miss the days when the install process was copy . to /<appFolder> and the uninstall process was delete /<appFolder>
I don't remember this ever being the case, even in times of DOS.
It still is for a lot of Mac Apps. You download a DMG, and you get somethinglike [0] where you drag the icon over, and it installs. The last app I uninstalled also removed the matching Library Support folders, which was neat!
[0] https://stackoverflow.com/questions/8680132/creating-nice-dm...
I remember software, tools and some games shipping like this forever, typically they have a "portable" label slapped on them, bet you can find Windows software/games still shipped like this today, if you look for "-portable" or "-archive" rather than "installer".
One quick example, offers an installer or a ZIP archive, the "installation process" for the ZIP archive is basically "copy files out from archive && ./executable", installer does a bunch of other stuff: https://www.openttd.org/downloads/openttd-releases/latest