I recently found out about the LFS project and their sub-projects. Is the HLFS Project only for
production-quality servers, routers, and firewalls
or is it also recommended for securing your desktop PC?
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According to the HLFS page:
Hardened Linux From Scratch (HLFS) is a project that provides you with step-by-step instructions for building your own customized and hardened Linux system entirely from source
The project will only be "initially geared towards building production-quality servers, routers, and firewalls" the list you quote from that page. You can extend it with BLFS packages. The BLFS book was updated last September, after 5 years, so is fairly up-to-date.