It’s easier on your neck to look side to side than it is up and down. So to get more screen real estate it makes more sense to go horizontal. Anecdotally, I constantly have two documents or a document and a web page open next to each other on one monitor. The landscape framing works really well for that.

Or songs off the Taylor Swift album

Tesla is a great example of how genius is not a generalizable thing. He is the reason most of us have electricity, but he was a mess when it come to understanding people.

You are correct. The only other thing that Lincoln is criticized for is suspending habeas corpus during the US civil war. I don’t know what the person you’re commenting on is on about. They may be a confederate sympathizer.