Have you heard the live stuff from 1970? (i.e., Boston Tea Party stuff, either of the Vaudeville Years packages?)
I think their strength was their live show.
After 30+ years of listening to "Then Play On", then hearing the outtakes & live material from that era over the years..."Then Play On" does sound incomplete. Just like listening to the Beach Boys' "Pet Sounds", then listening to all the outtakes of the box set, making "Pet Sounds" (for all it's glory) seem incomplete. There was so much AWESOME stuff that was left OFF that it's mind boggling!!
Sure, I'd love to see the same "vault assault" of CD releases from the 1971-74 crews that has occurred with Peter's era! That would be awesome. I will agree that the "Future Games"/"Bare Trees" incarnation has been sadly ignored by the "powers-that-be" of the Fleetwood Mac power structure. If there ever was an incarnation of the Mac that NEEDS some delving into, that is definitely the one.