Modern displays inherited their from factor from earlier tech like cathode ray tube displays and film. Those techs had rectangular shapes images for reasons of practicality.
For the longest time, round displays where they existed for special purposes were just regular rectangular ones with the corners covered up. Only in the last couple of years have actual round displays been produced en mass. Those are mostly in the size of smart watches and the computers connected to them still treat them as rectangular displays and just don’t make use of the missing edges.
This is another reason: without displays displays, there hasn’t been a lot of media produced for round displays, which means that nobody wanted to make round displays because there was no media for it.
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