I personally like it being in the upper left, that way I can leave it toggled on to remind myself of things versus having to constantly check back. For as long as I can remember there has been an issue with modded gui elements going in two directions and in an ideal world everyone would agree on a standard. Adding in things like fat controller, ion cannon, bob's inserters button and clock, etc makes for quite a mess in the top left corner of the screen! I hope eventually the devs implement the ability to move gui elements similar to Cities Skylines so we can customize things. Factorio with the toolbars on the side would be a dream.
Another crazy idea would be to make it one of the new big buttons in the bottom right with copy, paste, etc.