You'll always need Windows to do things like BIOS updates (some exceptions), firmware updates, vendor warranty/support claims (as most vendors won't support you if you only have Linux), and run apps that are only available on Windows.
You'll always need Windows to do things like BIOS updates (some exceptions), firmware updates, vendor warranty/support claims (as most vendors won't support you if you only have Linux), and run apps that are only available on Windows.