In the Netherlands the 10 II is for sale as well, and they ship to Germany:
Oh, I see you are Dutch 
The pricewatch on tweakers.net is the right way to see where it is for sale.
https://tweakers.net/pricewatch/1524124/sony-xperia-10-ii-zwart.html
By the way, the yearly change of model has not directly to do with the environment. Only when people buy a new phone, while the old one was still fine, is it an extra burden. Ofcourse, a yearly new model does invite to buy again, but that is the same with laptops I would think.