> Among the "security improvements" that they have listed we have: > > - Remove systrace. - Remove Linux emulation support. - Remove support for the usermount option.

Systrace was used in sandboxing applications before pledge existed. Pledge has now made this defunct so it's being removed.

The Linux emulation support was seldom used in OpenBSD, so it's being removed.

The usermount option was found to expose bugs which users with this option could cause the kernel to panic, so it's being removed.

That all seems pretty sane to me.