[ericd]

Think of them like AWS instances, with a partner being an XL and an associate being an M. Big firms can spin up a lot at once to hammer the other side with legal paperwork, but it starts costing you quite a lot per month. Sometimes there are jobs you really need an XL for for maximum concentrated firepower (like negotiating in person, where someone even slightly better can be worth millions/hr in outcome), but oftentimes a M can be a better fit for the task (paperwork, legal motions, almost everything else).