That was mentioned, but "image quality" was said to suffer. I don't know of any other effects, but viewing angle gets wrecked: Ordinarily, screens are designed for wide horizontal viewing angle, so people (all approximately the same height) may gather around one display, or one person can move around on their wheely-chair. That's a tradeoff against vertical viewing angle, of course, so when you rotate, now the spider on the ceiling and the mouse on the floor can read clearly, but you start having trouble if you move a foot to the side. Not so good.

My preference would be one with symmetric viewing angle and rotatability...