>>You don't laugh at Samba for using Linux-specific splice() syscall to accelerate transmission speed, do you?
Of course not.
But Samba runs on a variety of platforms nonetheless. If it wouldn't I would not consider it serious software.
Init is an important subsystem of an operating system. I'm sure it can be redesigned to work faster or in parallel, and I'm glad people are looking into it (even though it's not that important for my use cases). But replacing it with an implementation that addresses just the most popular use cases and ignores the rest is cutting corners. If that implementation presents those cut corners as "features, not bugs", I don't consider it a serious contender for a replacement.