Pretty much. To me, folk guitars through a pickup all sound the same.
Don't get me wrong. I love K&Ks and JJBs. But if you want people to hear your guitar, use a good mic.
Couldn't agree more. Using the same internal pickup inside an acoustic guitar will yield a very similar results, whether you're playing a Guild or a Harmony, a Martin or a Kay.
You can "mod" (shape) the output sound according to your taste, but you're modding the sound of the pickup, often in an attempt to make it sound more like your guitar. That should tell you something.
I understand why people use pickups in acoustic guitars in a live setting -- it's easier and you have a bit more control, especially if you don't have the luxury of having a good soundperson.
I prefer to go through mics. What I've found is that soundpeople generally LIKE working with acoustic instruments and enjoy trying to make them sound as good as possible. Many times I've had soundpeople say to me after a show that it's a pleasure to work with a good sounding acoustic guitar.