Once upon a time, Chris Murphy <lists(a)colorremedies.com> said:
An additional topic is having boot entries for Windows (and macOS)
that don't work in the meantime. While we could just remove the scripts that create
these entries to chainload another bootloader, they're still needed for BIOS systems
which don't support bootnext.
But not all Windows chainload boots will fail. It's not even all that
easy to tell which Windows installs will or won't work... the presence
of Bitlocker is not a 100% sign even (it could be an unlocked Bitlocker
install, which doesn't get the TPM measure and fail from grub).
Chris Adams <linux(a)cmadams.net>