Every lab will do smaller batches in rotary processors - even if they own hanger type (dip and dunk) processors, don't hold your breath that pushed colour or less common black and white film types will go through them. Unless the lab is running so low on jobs that they can modify the processing speed - which usually implies a volume where their chemistry is not perfectly regenerated.
So, no, dip and dunk is not the king of processing - it is much superior to continuously processing minilabs (where any slack in the maintenance will show up in the shape of scratches and dirt embedded in the emulsion), and more affordable than rotary or hand processing, but it is lacking flexibility, and its quality depends on a continuous work load (or high enough prices to keep the thing running all week on test strips). Back in the days I avoided having film processed in the first few hours of the day, on Mondays (when the chemistry might be off spec after the weekend) and Fridays (when every agency pushed for having their "this week" jobs finished, so that the lab was sometimes working above the capacity limits).