It's not hard, but how many people will really spend the time reading about it?
In my experience, customers with a non tech background don't care about the details, but rather if it will be better or not. If it will, great.
But I agree, it's being slightly disingenuous to the people who do want to know why, or are curious what 'web experience' they are missing out on.
Not my experience. Customers will generally do whatever it takes to insure a good supply from a good vendor.
new browser technology will never take off if people don't start switching over
True. So what's so hard about telling them why you want them to do something?