The question of "To dip, or not to dip" is one I've asked myself ...a lot...especially the last two years. I'm doing a little "test planting" this year, to test my 'theory", that, unless there is an obvious disease problem...the bleach (even a "quick dip") does more harm, than good. Folks seem to dip A) to kill bores that might be inside the rhizome........but, if they're "inside" the bleach can't get to them, and, if they're NOT inside...pick them off (or 'out") B) to stop "rot".....if there are obvious sign of bacterial soft rot...yeah, scrape it off, give it a quick dip, (or a sprinkle of comet cleanser) let it dry--unplanted--until the wound scabs over, and plant it. Bleach (chlorine) is a pretty good "anti bacterial" agent. But, if it's a "fungal type" of rot....bleach doesn't work very well, and a "soak " long enough to kill the fungus (which usually penetrates deep into the rhizome) would not only kill the plant, but turn the rhizome and leaves, white as snow.
Next year, after I can see just what developes with my test plants, I'll know for sure...one way, or the other...if my theory is sound.
