> Also Windows' reboot options and its annual upgrade tend to mess with the boot variables. I had to help repair colleagues' laptops that had Grub's boot entries erased by Windows upgrades.

I'm mostly a Windows user, and this has never happened in my experience: at worst Windows might reorder the UEFI boot options, or change the default boot option, but it has never overwritten or erased an entry.

At worst they are still available in the F12 boot menu.