I guess my point is that I don't believe a bucket can be "not mixed". It's added to the buckets from a huge hopper with tons of salt premixed, and the settling that may occur is negligible. Certainly nothing bad will happen from rolling it, other than running over a toe
I just think people often go through silly rituals for things when they don't have to. Yes, I take a more relaxed approach to all this reef stuff, so if rolling helps one sleep better at night, I'll just leave it alone