Third-party startmenu program like Classic Shell can still be useful for Windows 10 users who prefer the older Startmenu style of Windows 7 and other older Windows startmenu designs found in Windows 98, XP, 2000, and ME.
If your startmenu in Windows 10 is broken or not opening, using a startmenu replacement programs can be one way of getting a startmenu again, so you can shutdown your computer, and launch apps and programs with a third party startmenu program.
I think bad/currupt Windows Updates, computer viruses, and other computer problems can sometimes break the Windows Startmenu, so using a third party startmenu program can be a way to get the startmenu back without the need to reinstall Windows which may not be possible if you don't have internet access, or don't have the installer files for Windows 10 stored on a DVD-R disc or USB external drive.
If your startmenu in Windows 10 is broken or not opening, using a startmenu replacement programs can be one way of getting a startmenu again, so you can shutdown your computer, and launch apps and programs with a third party startmenu program.
I think bad/currupt Windows Updates, computer viruses, and other computer problems can sometimes break the Windows Startmenu, so using a third party startmenu program can be a way to get the startmenu back without the need to reinstall Windows which may not be possible if you don't have internet access, or don't have the installer files for Windows 10 stored on a DVD-R disc or USB external drive.