My use case was doing remote language classes. I had multiple programs open on my desktop and had my lesson book on my desk in front of me. I was looking at slides that I had to read, with PDFs open next to the slides shared during the video call. Joining on a phone was prohibitive compared to joining from my desktop.

I’d imagine anything where I need to read slides/notes on a screen would suck if done via a phone. In fact, the only time I use my phone is if my video is off and I am listening passively.