I have had contact with support and apparently, there is no way to lock the Illustrator artboards so they do NOT rotate. I work on a touchscreen and the artboards are constantly rotating. My work is constantly interrupted as I have to constantly stop and reset them. I was told to lock my layers - this does not help in my case at all lol
I have subscribed for years and it is so frustrating to know I won't be able to continue using illustrator for my business. I just want the option to lock the artboards so they don't rotate.
You might add your comments to the Illustrator Uservoice site so that the Illustrator team will see them. There are similar comments to yours on the original feature request to enable artboard rotation: