Great new addition to the site Ian, and I fully agree with your argument. There has always, it seems to me been conflict over photo formats, film sizes, paper sizes etc. I mean A4? Whats all that about, its a useless size when it comes to printing photo images. Using an average DSLR you have a 3:2 ratio and the only paper that fits it is 6x4" and thats an imperial size
Some photo papers were throw backs from the days of plate cameras but 35mm never fitted 10x8 etc. Surely it would be easier these days for paper manufacturers to standardize more on a camera frame format.