I'm not sure if you're really all that familiar with pre-HD formats, but 4:3 SD is not 1:1 aspect ratio... though it may look "square" to those who don't have 60 years of 4:3 TV viewing experience, as well as over 15 years of video production work during the transition between SD and HD formats.
I just went back and watched ST Voyager S1E1 and when viewed on my Nvidia Shield, through the Netflix app, it's perfect 4:3 format as it was produced.
On both of my Xfinity HD boxes, it's stretched to fill the 16:9 screen... on the same LG HD Projector, as well as my 4k living room TV.
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