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Split-/usr on Linux became so broken, that even Gentoo maintainers decided they can't fix it
(gitweb.gentoo.org)
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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.
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These days, AFAIK network boot is done thru initramfs. It loads rootfs in most cases I've seen tho.
True, network boot is not best example. Shared /usr is much better one. For example if you are school that wants to buy 100 thin clients for very cheap.