EVF is much more convenient for near vision glasses wearers too.
That said, I think you need an R5/R6 generation body to not be annoyed by mirrorless readout slowness and VF lag.
I have a very high res (mirrored) medium format system and keeping the “focus trim” set correctly to align the AF system with sensor seems impossible, seemingly changing with temperature or other conditions.
Focus also shifts with aperture, it's impossible to have an open loop system that works accurately. Some lenses will front focus wide open, be spot on at f4 and back focus after that, or the opposite. Or be spot on wide open and oof when you stop down.
How so? I use diopter adapters in my DSLR eyepieces, since the built-in adjustment doesn't suffice and I hate to shoot through glasses that prevent me seeing all of the viewfinder.
I wouldn't have thought an EVF could natively improve on this, but now you've got me intrigued.