When it comes to rationalizing word limits, I think one can chalk it down to the laziness of the professor, but I think you can also chalk it down to preparing us for the real world, for in the real world, local court rules often limit the amount of words and/or pages in the pleadings/briefs that you file with the court. Then again, maybe we have such local court rules because of the laziness of judges/clerks, too...
whose side are you on?
p.s. i've been working at a law firm here in NY. this is the first time i'm hearing about a page/word limit. but once again, my firm doesn't do class actions.