> The use of legacy or uefi are changes that users have to manually change
> themselves in their bios from manufactures default settings. There is no
> tool that can do that for them or migrate those settings however users
> should be able to change this for hardware around 2010.
>
> The Installer would have to try to detect and make a choise sd-boot ( If
> settings equall UEFI ) or grub2 ( If setting not equals UEFI ) depending
> on it's results.

grub2 supports UEFI, doesn't have to be sd-boot

> As an example here's the BIOS/UEFI history for Apple hardware.
>
> 2012 and older models only support legacy BIOS Mode
>
> 2013-2014 models support both EFI and BIOS with the default setting
> being set on BIOS
>
> 2015 and later models only support EFI
>
> Different manufacturers have different timelines and different default
> settings but I think it's safe to presume from this year onwards they
> will all drop the legacy support and default to UEFI.

Microsoft has been actively moving requirements to UEFI for some time
to in both server and workstation side of things as well as other
security improvements like the requirements for TPM2
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