Hi everyone! I just saw a bunch of tweets linking to my site and traced it back here -- I'm the person behind this site and if anyone has any questions, I'd love to answer them here!
NB Really good job - I found this quite fascinating.
For instance, a lot of the buttons on these screens are very extremely pushed to the side when they're in the corners. Look at the Shopify one specifically.
And while yes, some users will have screens that huge and designers will have to deal with that edge case, I feel it's too atypical to use for a typical user's experience.