another disadvantage of watching films with the matte opened, as i've mentioned 48.3 times 

 is that the film looses it's dramatic strength cus you're seeing 33% more estraneous background surrounding the composed and framed image.
 So instead of a dramaticaly shot close up when some lover is crying to your face and it fills 100% of the frame and therefore your attention, as it dramatically should, you get a head and shoulder shot where the face occupies only 75% of your attention and field o vision and you see some neck and maybe some trees or clouds or a window and err.. you're distracted 
 
So when watching open matte films on 4:3 full frame  you see image youre not suppossed to see and it looses impact, and when watching hard matted films on 4:3 full frame (pan/scaned) you see less image than the one youre supposed to see and you loose part of the visual story, scope, characters, art design beauty, etc.
But i can understand many people prefering the full frame, it's not those damn black bars, it's that the image is smaller with letterboxing, be it by shrinking it or by covering it, and we tend to like images that fill our field of view (everyone would prefer to get a 8 x 10" photo of a subject we like than a 3 x 5 postcard)  Widescreen movies in theater screens are larger. The wider they are, the bigger they are, the oppossite of what happens on most hometheater screens and TV's
Displays should be wide enough to make most formats the same height.
(That's one reason i don't like 16:9 displays much more than 4:3 ones. Batman bigger than STAR WARS? No way!)  Home Theater Projectors with zoom lenses are good in that respect cus you can zoom the widest/letterboxed movies to be a tall as  the 1.75 and 1.375 movies. But not everyone has projectors  and the mayority  have fixed size 4:3 and 16:9 displays. So to them a full frame open matte image may be more satisfying than a shrunken/covered up smaller one even if the larger image is compositionally "incorrect"
Cus you're trading one aspect of the movies (correct shape/visual presentation) for another equally essential one: size/detail. 
(a 22:9 display would cover 99.9% of all movies btw)
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I want 25:9 displays 
