If there are advantages and there are many who say theres none, its in a one speaker for one job scenario.
Woofer, mid ,high kind of thing leading to a more balanced spread from the cabinet, but this involves a much more complicated crossover and not many boutique companies are willing to spend that given the return that it would generate.
But time and trend moves on and with more capable mid/ tweeters coming to the market then the need for 3 way cabinets and the complex crossovers are becoming less when a 2 way can do the job while maintaining good dispersion angles.
Jim.