If you look at any normal written text, most of it is lowercase.

pavlov · on Sept 10, 2020

I think this is part of the reason why many systems in the past favored uppercase for programming languages: it’s easier to tell apart comments from code at a glance.

pklausler · on Sept 10, 2020

Many early character sets (CDC Display Code, UNIVAC's Fieldata) were only 6 bits wide, so there wasn't room for two cases of the letters until 8-bit EBCDIC and 7-bit ASCII came along.