No I´m not joking - you just answered the question by yourself:
>...especially since an EVF can maintain a high enough brightness to keep the eye at optimal viewing conditions.<
Do you really think an optical viewfinder will give you the smallest possible eye aperture (and sharpness) when there are several stops of original scene disappearing in the optical system of 1.Lens(f stop!), 2.Mirror, 3. Prisma and 4. okular enlargement. Did you never experience it to be difficult to watch an image on a DSLR finder in Bright sunlight - why do you think people use Eye cups, maybe even black cloth or hoods over their cameras ? Because the contrast between original and image is so large !
It would be interesting though to get a measurement of finder brightness in Lumen of an EVF compared to the same scenes watched on optical finders (LeicaM and DSLR)