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Systemd: Hidden Gems for a Better Linux
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From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Every major distro uses systemd, because before that it was nearly impossible to properly implement things that distros have to provide.
Most startup scripts were incredible set of hacks to make services behave. Those were very inefficient (they could not be efficient being shell scripts calling other commands for various simple repetitive tasks) and would often break when circumstances were different from ideal.
Systemd just makes building Linux distribution much easier, and the resulting system is more reliable, more consistent and more flexible. Why would distro developers chose anything else?