My Charvel ATX acoustic electric has a walnut bridge for that "unelectric" sound.But I know what you mean.
Adjustability for intonation is the key.Although you can intonate a "non-adjustable" bridge by filing,it sure is a lot easier to move those little string saddles!
Tom
One thing is that you lose your ground to the strings making it a little noisy. If you have EMG s you would not need the ground, or if you had a wooden bridge with a metal tailpiece, that would ground the strings. Other than that it's just the tone is a little softer and less sustain, in theory.
Well said guys,
Intonation problems indeed, especially with the lighter gauge strings we like to use these days. Come to think of it, I have seen many archtypes with wooden bridges and metal tailpieces.