If the non-white background is an offsetting factor, why isn't the fact that #000 is actually realized on LCD/LED monitors as "dark grey" also an offsetting fac

If the non-white background is an offsetting factor, why isn't the fact that #000 is actually realized on LCD/LED monitors as "dark grey" also an offsetting factor to reduce contrast? Apparently, it looks like there's a difference of opinions (rather than scientific rigor) whether the "dark grey" of #000 is "light enough". I'm fine with it ultimately boiling down to subjective aesthetics but sgk284's post made it sound like #000 eyestrain was scientific fact.