I set up all the requisite things, and since it was his first time, we went through a few common desktop workflows tailored to his needs. There I noticed: he was single-clicking where he needed to double-click—e.g. while opening a directory. I briefly explained the differences between the two and we tried again. He got better, but still struggled. I biked back home wondering if he'll continue to struggle with the double-click. :-(
My professor's use cases are quite simple: writing articles in Libre Office (he's already familiar with it on Winblows), YouTube, and a browser—only one tab at a time; he was blissfully unaware of the concept of tabs until we walked through it!
Thanks for the idea.
There's a lot of anecdotes about how uneasy/annoyed/bothered it can make you feel when watching someone unfamiliar with a scroll wheel instead mouse over and slowly click+drag the scrollbar, but the big one for me is seeing someone double-click on a hyperlink...
I also see people use the arrow buttons on the scrollbar. But they just click the button repeatedly instead of holding it down. Which means that for a very long page, it can take them a long time and hundreds of clicks to get to the section of the page they want to see.
Actually, a lot of people have trouble just single-clicking, so double-clicking is even more of a challenge.
A lot of people just can't get the knack for clicking twice in quick succession. And the inconsistency between when they should single-click and when they should double-click causes a lot of confusion.
I think it probably would make life easier to get rid of the double-click.