I can only provide a personal observation. I've been a happy user of a sit-stand desk for more than three years, and one part of the results does sound plausibl

I can only provide a personal observation. I've been a happy user of a sit-stand desk for more than three years, and one part of the results does sound plausible. I tend to spend >70% of my time with the desk at standing height - dealing with emails, taking part in office chat (slack), and reviewing changes of all kinds. I have no problem doing some coding when standing up too. But when I need to do deeper code review, thoughtful research, or otherwise dive into a complex piece of code I find myself sitting down. I like the standing mode. My back feels better for it, and indeed, if I spend too much time sitting down my back starts to complain. The ability to adjust the height freely feels like I have the best of both worlds.