NEED what OVFs offer...unlimited dynamic range
Lets just put this one to rest. Your eyes do not have unlimited dynamic range, it's only about as good as your camera.
Modern cameras have much better night vision (ISO well above 1000).
Also, I have yet to hear a good argument for why looking at the environment with your eye through the lens helps you take a better picture.
Sorry, but I can see FAR more dynamic range with my eyes than my camera sees. Whether it is my brain blending "frames" to achieve it, or individual exposures...the mechanics of how don't matter. When people say 8-11 stops is similar to 10-14 stops, they are ignoring the fact that a stop is factor of two. It's a difference of 8 to 64 TIMES greater tonal range. My eyes see at a minimum 14 stops...from clouds to bark detail in the shadows, which is probably closer to 20 stops than 14 stops. It doesn't matter that my brain is "doing all the work" to blend the information the biological device that is my eye actually receives...I SEE it.
Now, I don't say my eye can see unlimited DR. However an optical viewfinder is not going to limit you further. The OVF itself is effectively unlimited when it comes to DR...so my eyes can operate at maximum capability when looking through an OVF. When it comes to shooting in lower light, with my eye to the viewfinder, being able to utilize the full 24 stop dynamic range potential of my eye...i.e. allow it to adjust to the dimmer light so I can clearly see my subject without noise for the purposes of framing and composition, regardless of whether my camera could see the same thing when read out at 60fps, is a huge boon. Jack up the gain on an EVF or Live View...and what do you get when it comes to darker scenes? Dark...with a lot of noise. This problem is even exacerbated further when doing something like astrophotography...you can't see the night sky in an EVF or on Live View. You might be able to see some of the much brighter low magnitude stars, but overall you can't compose. However I can look through an optical viewfinder and see everything as if I was looking right up at the sky without a camera in front of me. The dynamic range of the human eye is VASTLY superior to the dynamic range of a camera (and an EVF.)