syscalls are just a fraction of the surface area. There are many files in many different vfs you need to implement, things like selinux and ebpf, iouring, etc.

syscalls are just a fraction of the surface area. There are many files in many different vfs you need to implement, things like selinux and ebpf, iouring, etc. It's also a constantly shifting target. The VM API is much simpler, relatively stable, and already implemented. Emulating Linux only makes sense on devices with constrained resources.