When have I missed that ? Read what I've written here;
Reply#8 “with so many different manufacturers it seems unlikely that could happen any time soon”
Reply #22 “It won't happen,“
Reply #33 “it's unlikely a major manufacturer will take the initiative to make it happen.“
Reply #35 “but needs vision to implement, so we're stuffed.“
I'm not living in cloud cuckoo land here, just offering a possibility of what could happen that might be advantageous to the original issue of the OP and probably the rest of us too.
I completely understand your point of view on that, but I'll disagree how important it is. Designers have to work to some limits of tolerance in their design options, moving the diameter options to within the nearest mm wouldn't really make that much difference to the overall quality of designs.