Have you ever seen a table benefit from it?
Yep. Several. Over the course of the years, I've had opportunity to teach several folks how to play, who really needed a handle on what a "role" really was, and how you build a character and personality that isn't your own, and display it for the rest of the players. For several of these folks, having a guideline to work with was instrumental.
For a few players, the "there are consequences for your actions" was also a help, and a role-playing tool they liked to play with.
Also, for several tables that were admittedly playing in large part for escapism, the mechanical ability to just figure out, once and for all, whether the bad guys really were bad, was a solid way for them to be ale to relax more into the game.
And, in a couple, the system was well-used to drive some of the metaphysics of the world - when Good, Evil, Law, and Chaos are palpable forces, as much as gravity is, that can be a great story-driving tool.