>As I was reading all the post I was dying to say "LIVE >VIEW" if you need 100% but you beat me to it.
The problem with Live View is that you have to hold that camera out away from your face. Depending on what you are shooting and your camera settings this can cause blurry photos because you don't have a stable platform. For example I can shoot in very low lighting when I support myself with good handholding techniques.
Also for some types of shooting that require a heavy lens it's not really practical to shoot all day holding out the camera. That's a quick way to get a sore back and tired arms.
>Cant we just know that the subject will have a little extra >around them that I cant see. I think that you will adjust your >shooting habits knowing that you have more then you see.
That's probably what most people do to compensation but as I've said in my other post there are times when you get the edges of objects within that missing 5% of the viewfinder. Extra space around your subject would not be a problem if it were just dead space but having something like the edge of a trash can sneaking into your "blind spot" doesn't make for a great picture.
And depending on how you frame the subject, cropping out the trash can in post processing while keeping a specific crop ratio for print means also cropping off the top of someone's head, etc. This means costly editing time to digitally remove the trash can.
Of course not everyone has to deal with these problems but trust me these problems do exist. The 95% viewfinder is a concern but only for a small group of people. For most people it's not a deal breaker.