

Oh, don’t get me wrong, I fully agree. Undefined behavior is terrible UX and a huge security risk.
Undefined behavior was kind of okay when RAM and storage were measured in kilobytes and adding checks for this stuff was noticeably expensive. That time has passed, though, and modern developers have no business thinking like that, even ones working on low-level languages.
I should’ve phrased my comment differently.
Given the usual quality of BIOS/UEFI option descriptions it’s remarkably close to being sensible. I would’ve expected something like “enables limiting CPUID maximum value”.