> systemd was not introduced to decrease boot time

Might wish to check your history a bit. From the horse's mouth:

"Unfortunately, the traditional SysV init system was not particularly fast."

In fact, if you read the entire blog post, the biggest gripe Pottering keeps repeating is how slow SysVInit is, and how to address that.

http://0pointer.net/blog/projects/systemd.html

> Totally made up. systemd's DBus library provides equivalent support for usermode DBus and kdbus.

Well, it is no longer optional to compile in systemd; it can still be deactivated at run time, but the code (and checks to see which one should be used) will always be there.