That can work but ideally the most economically attractive option will be to have orientations that maximize production. This is indisputable in an attractive FiT market like Japan although you could have a debate for a self-consumption market like Germany.
It is a relatively simple matter to move your daily loads around to capture the peak power produced by a south facing array - it's just not something we do yet. It would be easier to capture a smaller peak but then you'd be getting less energy per installed watt. That doesn't seem smarter to me. Frankly, Germany shouldn't be goofing around with East/West orientations - they should be concentrating on load control.
I attached a spreadsheet in my previous post. That spreadsheet shows how some very simple load shifting strategies can significantly improve how much solar you can integrate.