> the long accepted idea that lower case is easer to read than upper case

uh.. that sounds to me about as accepted as "cursive is easier to read than print".

Upper case is the canonical form of our alphabet (as written in Latin) while lower case is a newer addition (adapted from many greek letter shapes) that may be easier to write in rapid succession, but as such that also makes it one step towards cursive.

When I was a child in elementary school I was taught that "you all have to learn cursive because when you grow up that's what adults use, they don't use print any more". I remember thinking about that while driving with my parents, and asking them "if adults use cursive exclusively like my teacher says then why are all the road signs in print"?

I can levy that same query to your statement: if it is a long accepted idea that lower case is easier to read, then why are all of the road signs (which famously prioritize ease of reading) always written in all caps?