When documenting the security model, Apple use the example of an XNU kernel developer wishing to test their changes on a second macOS installation. It is apparent however that the platform security model was engineered to allow third party operating systems to coexist with macOS in a way that does not compromise any of Apple's security guarantees for macOS itself. Rumours circulating that Apple are actively hostile towards efforts such as Asahi, or that their security must be bypassed or jailbroken to run untrusted code are unfounded and false. In fact, Apple have expended effort and time on improving their security tooling in ways that only improve the execution of non-macOS binaries. An example of this is giving their Boot Policy configuration tool the ability to wrap raw AArch64 code in a proper Mach-O format starting with macOS 12.1. This is only ever required for enrolling a boot object that is not already a macOS kernelcache.
https://github.com/AsahiLinux/docs/wiki/Apple-Platform-Security-Crash-Course