Quality isn’t overly important through the viewfinder. You’re just using it for composition.

Whereas an EVF can fairly accurately show you composition, exposure at current settings, any sort of raster graphic they want on the screen (eg the head silhouette to frame passport shots), etc.

My biggest gripe with the EVF is that it kinda sucks for astrophotography. I have to crank the ISO way up, take a test shot, and then turn it down before a long exposure. Our eyes are just much better at focusing on dim points in the sky.