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I think another reason this is done is because too little sound in a particular frequency range is more acceptable than too much sound in it.

Will, if what you say is true, then why not implement a true symmetrical -24dB slope high-pass/low-pass electrical xover in the prepro. Doing it that way would provide a smoother match-up with a wider variety of mains and subs.

With a symmetrical crossover there's a greater chance of accidentally (due to room accoustics) hearing too much sound near the crossover point. They don't want you to hear overlapping sounds from different sounrces, at the crossover. At least that's my guess...