For thousands of years, humans didn't do a lot of things, then suddenly we started doing them. Every innovation has its time and its reasons.
Remember when the young monkeys started washing their food in water to remove the grit? Why didn't the older ones figure that out? And why did they not join in on the discovery right away?
There are dozens of examples of animals not doing something for thousands of years and then one day...
You picked the thoughts right outa my brain! Eggs Ackley!