[yakubin]

Which also prevents good privilege separation/sandboxing. See PAM vs BSD Auth, where the former cannot be secured with anything like pledge/unveil or Capsicum, but the latter can.

[pjmlp]

True, the question is if everyone is willing to accept the higher resource costs in process and CPU cores management to make it a non-issue.

Which given the mikrokernel hate in some circles, doesn't seem like it.