Yes, that's the obvious reason for it, but having a reason doesn't make the icons any more comprehensible. Good luck using those appliances if you're a visitor who doesn't have the manuals and hasn't learned each manufacturer's unique iconography.
That's depends very much on age, class, geographic location. Someone could have grown up imprisoned behind the Iron Curtain, hence learning Russian as a second language. Nonetheless they deserve appliances, websites and infrastructure which they can use and understand.
