It's like TIFF, or like USB Storage.<p>Sometimes when it doesn't really matter what is chosen, one powerful entity can just pick and it doesn't matter. Even if maybe option B is very slightly better, clarity that we're all doing A is arguably better than some do A and some B and all suffer.<p>Unicode / ISO 10646-1 is an example like that. Some people don't like Han Unification, some people think UTF-16 reserved codepoints is an abomination, but mostly everybody is happy to live in a world where Unicode and ISO-10646 are effectively the same thing seen from different angles, not competing standards (Yes that could have happened)<p>Other times though there is no single entity powerful enough and willing to insist on one way forward, and no natural agreement on whether to do A or B. Instead parties that want to do A, and parties that want to do B just agree either is fine. The result is "standards" like USB Storage, TIFF or DICOM that leave far too much as unresolved choices.<p>Example: Some scanner manufacturers agreeing TIFF had designed scanners that start from the top-left of the eventual document, others started top-right or even bottom-right. If TIFF said "Images are top-to-bottom" the bottom-right scanners become expensive because they need a huge RAM buffer. Vice versa if TIFF says "Images are bottom-to-top". So... the actual TIFF standard says either can be true, you just flip a tag in the header to declare which way up the image is. Decoders have to carry all the burden of dealing with this, or be incompatible with some images to the confusion of users. ("Why is this picture upside down?")<p>These standards are marginally better than nobody agreeing anything, but only marginally. They're like that mediocre fusion restaurant you end up at when half the group wants Chinese and half wants Indian. Nobody likes this (hypothetical) fusion restaurant, so now nobody is happy, is that really better? I guess it's an improvement on spending the evening arguing pointlessly, because at least you can eat now.