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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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My question would be "how do hardening kargs differ from a hardened kernel"?
Kargs can be dynamically applied and work easily on immutable distros. Tbh a monolithic unhardened kernel is my biggest problem with immutable Distros, as changing that is quite drastic.
It really depends on what flags the hardened kernel has. You might get the same result with args or you may get something totally different.
If you want to learn more try Gentoo