I think heated grips were very much a BMW thing along with shaft drive obviously northern Europe offers a unique set of challenges, And for many of us our bike would be our sole mean of transport. So everything from fairings, proper mudguards, ex army riding kit and long before handguards we had hippo hands I'm sure there is a image out there. Of course the ultimate add on as the family grew was a double adult sidecar!
Rick brett once told me that the bulk of Japanese bike production went to the USA especially the warmer parts were heated grips and weather protection was not really a consideration. And awash with leisure cash that cb750 or kettle was not your sole transport.
Two of my riding friends suffer from vibration white finger from using tools in coal mines and heavy industry without heated grips riding outside of summer is almost impossible. Most riders in U.K. are probably 50 plus so anything that helps keep us comfortable is very desirable.