A), I know most people don't, but I find it annoying, NOT hard, annoying, going back and forth between 12 and 6 strings. It gets to be a pain readjusting my playing style everytime I switch guitars.
B) Re-stringing. Need I say more? HUGE pain in the ass, especially on a ricky.
C) I can do more on a 6 string than I can on a 12 string. I feel like 12 strings aren't very versatile, in that they're mostly using for chords or arpeggios. You can't really solo or riff that much, and when you do, it's a bit difficult, at least more difficult than it is on a 6 string.
I know no one asked me this question, but I just thought I'd let some people know why I didn't go FULL Edge on this purchase

Alex