I feel like you don’t get to criticise the value of the system if you grow up in a communist country that lacked access to the different sizes of paper and enve

I feel like you don’t get to criticise the value of the system if you grow up in a communist country that lacked access to the different sizes of paper and envelopes that make the system useful. Clearly you missed out! Making an A5 booklet from A4 and mailing it is something any print shop I grew up near would do. No idea what the advantage of a whole unit is supposed to be; nobody is sat around with a ruler measuring A4 cuts. The tolerances for paper manufacturing need to be specified in tiny fractions of a mm either way. As for actual typographers, they don’t use metric units, the size of the paper is not of great concern.