My phone places indicators in a fixed order in the top right of the screen and it works nicely.
But, in a windowed environment (i.e., not my phone) I like my windows near the top and indicators down at the bottom where they're not intrusive on my current tasks. (E.g., that darn email flag keeps going up---I want it, but only when I'm "context switching".)
Different work idioms -> different indicator places.
I'd like to see the user experience research that Ubuntu is using to show that I'm in the minority here....