probably because I work in a room that has a fixed projector coming out of the ceiling (mounted on a piece of polished scaffold pole) connected to a desktop computer that I can set it up and make sure that I have a screen that is in focus, no reverse parallax's in my room. I think I am getting increasingly intolerant of a badly presented anything.
I work in a educational situation where so many building have been adapted, I know that my room in its fifty years has been a sewing room a science lab, and now a room full of computers.
so I have to get round the problems of a strange shaped room and odd acoustics as well as the lure of computers for students to play with and look at web based email working around the network restrictions firewalls. generally playing on line rather than studying, using proxy servers so as not to get caught.
Powerpoint and wonder way the students are so bored as soon as the presentation starts, not realising that most of the audience have been using Powerpoint since they were in year 4 (uk) 8 years old.
I am even more surprised when at supposed professional meetings presenters don't take the time to set up equipment to provide the best viewing experience.
I know that there is heaps of stuff on youtube, talking about death by Powerpoint, but I could cope with some of it if only the equipment was set up properly as well as the presenter not reading it out and then giving me a photocopy of it all!