I think this is the same of any branded product? Dell always works with Dell, Nokia with Nokia etc?
Not with camera's. Every time you buy a new Canon DLSR you get a new charger and a new type of battery. I can understand that between entry and professional models there might be a need for a difference. But was hoping they could handle their entire line with only 2/3 types.
Buy the way I also have 2 Nokia chargers. These things do change from time to time.
Even Apple shall consider a change. As they defined a new standard for cell phones. So in principle every cell-phone manufacturer will have to apply to this new standard. That would mean that your charger can stay also when you move on to another brand. Today these cell-phone chargers are compiling a big waste pile.