These start menu replacements hook into the OS shell on a low level, keeping the old incompatible version installed would (and has, in older versions of Win10)

These start menu replacements hook into the OS shell on a low level, keeping the old incompatible version installed would (and has, in older versions of Win10) cause the user to _have no task bar, start menu or anything whatsoever_ because the start menu replacement crashes and burns, taking Explorer with it. See also a similar comment[0] I wrote a while back about the policy to uninstall incompatible software. [0] https://news.ycombinator.com/item?id=12416422 https://news.ycombinator.com/item?id=12416422