for rocky but maybe mc2 is different, doser is not really a problem.
I grind individually for doubles, a small brush helps make sure no grinds left in burrs (still needed even if doserless?)
Doser may also help dump the coffee in a uniform distribution in pf, whereas doserless creates a mound ? (some folks use smart 3side tamper to help)
Rocky takes 20-30s to grind for a double, so with a doser, do not have to stand there with pf waiting, can be running final shot to warm cup in the meantime, and then take pf and instantly fill it ... all about work flow ...
I don't usually weigh - just 1.5scoops, I would like to find a 1.5 sized scoop.