Like Belmont said, the reason that people go with .1 mil adjustments is that there is consistency between the dot on the reticle and the adjustment knob.
Fractions of Minute knobs with mil reticles are commonly used but that's mostly because of tradition. Mil-dot reticles are in mils (metric), where the knobs are in minutes (standard).
Less math to do if you use a mil adjustment with a mil reticle.
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