Putting in all the effort to design a system that allows you to install an unsigned OS without it effecting the boot security of the MacOS partition is definitely helping Ashai, NetBSD and any other OS that would like to add support for the hardware going forward.
Also, designing the boot menu so that unsigned OSes can show up as valid choices or be set as the default OS.
As well as the EULA allowing the use of unsigned OSes.
>All of those things you listed also existed on x86 Macs
Nope. Security settings on the Intel Macs were per machine just like other PCs.
The system of allowing per partition security settings so the user could install an unsigned OS without it effecting the security when booted into MacOS is new on Apple Silicon Macs.
As the Asahi Wiki puts it:
>From a security perspective, these machines may possibly qualify as the most secure general purpose computers available to the public which support third-party OSes, in terms of resistance to attack by non-owners.
Also, designing the boot menu so that unsigned OSes can show up as valid choices or be set as the default OS.
As well as the EULA allowing the use of unsigned OSes.