My biggest concern is that I am not happy with the speed/refresh/panning/blackout performance of an EVF as of today.It really depends on what price range
And with small and medium RAW modes those with concern about file sizes can be happy.
I see the potential of EOS R/RF system but Canon has to tap the full potential yet.
Until then for my type of photography (kids/sports/wildlife) OVF outperforms the EVF by some margin.
About MP count:
And why downsample instead of having fewer but better native pixels? I prefer the latter. 30 MP is more than enough to me.
You also still lose time and calculation power while readout and downsampling the many 75 MP. Not needed here.