This is indeed an ideal viewfinder and that principle worked well for rifles and even for landing planes on aircraft carriers, where one lines up fiduciary points in space. That's how Apollo 13 crew lined up earth without any computers, just referencing the module's window with the blue marble in the distance.
These excel in concentrating on what you MUST hit. The rangefinder viewfinder also includes what is nearby to be included or excluded. That has advantages to some, but not essential to others. The ability of optical and EVF viewfinders to add shot information is a blessing and a curse, but one folk today take for granted, assuming it's no practical distraction to the art of photography.
Visually EVF's aren't up to stellar optics, for me too, neither, but it makes cameras more portable and that's good enough for me!
Asher