Like I said, I don't know how they are using the tolerance for the date at 6, since it's meant to be read for a date at 3. If you were to use it for the width of the gap on each side, then yes this is out of spec. I just can't say for sure that's how they are using it.
I don't think there is any design defect, but as you can see the clearance between the inside of the date window and the numbers on the date indicator is very small. This means they have to pay very close attention to how the dial is centered on the movement for it to line up properly, and not look crowded.
If you look at how the date is centered on the OP's watch in the last photo he posted, but look at the vertical spacing, you will see it is shifted high in the date window, but no one is complaining about that, because there is more space there and even when it's not 100% centered, it doesn't look crowded. If they wanted to make life easier, they could widen the date window in the dial slightly, but you can't do this too much or you will see other dates...
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