A good point. Makes sense if the weather is consistent.
For roof mounted panels, you've not got too much choice though...
It would be a good idea for them to do something to encourage more people to point panels east and west to help even out the overall energy production through the day.
Each location will have an optimum orientation for the panels.
For example, we sit facing south but below a steep north facing hillside. Nothing directly shades my panels in the immediate vicinity but the hill blocks the early morning (east/south easterly) direct sunlight - so we get more direct sun for longer by facing our panels to the southwest.
||Experiment first. It will take a year.|