I agree with PrivacyGuides on why to avoid Libre Kernels
https://www.privacyguides.org/en/os/linux-overview/#choosing-your-distribution
Linux-libre kernel and “Libre” distributions
We recommend against using the Linux-libre kernel, since it removes security mitigations and suppresses kernel warnings about vulnerable microcode.
AND
Proprietary Firmware (Microcode Updates)
Some Linux distributions (such as Linux-libre-based or DIY distros) don’t come with the proprietary microcode updates which patch critical security vulnerabilities. Some notable examples of these vulnerabilities include Spectre, Meltdown, SSB, Foreshadow, MDS, SWAPGS, and other hardware vulnerabilities.
We highly recommend that you install microcode updates, as they contain important security patches for the CPU which can not be fully mitigated in software alone. Fedora and openSUSE both apply microcode updates by default.