But the benefit to a circular display is that the entire display can rotate without any data loss — just like the inside of a compass. This means that, once calibrated with your head-level as “north” (you are a star, after all!), the UI will always know where your smartwatch is in relation to your eyeballs.
Yes! That’s one of the first things I noticed when I got my Apple Watch. I can never really have the watch’s text at an angle where I can read it comfortably without stretching. If I hold my arm up to look at the Apple Watch, the display is skewed about 15 degrees from my north. What a great idea that would be, if the watch face rotated as you moved your arm, or if it were simply set it – using a manual setting – to be at the most comfortable viewing angle.
Source: Round Smartwatches: You’re Doing It Wrong WatchAware