I just attended a seminar on guitar building. I wonder what kind of wood we are talking about. No wait, not the wood WE are talking about but the wood police. The only thing I'm aware of that is controlled is Brazilian rosewood but I can't see Gibson using any of that. 2 planks of Brazilian rosewood say 10"x18"x1/4" each costs the builder $2500 because it is so rare these days. The builder said he doesn't believe it adds anything to the quality of the sound but is more so you can say, "MY guitar has Brazilian rosewood, neener neener."
Gibson AJs were made (at least a few [6-8?] years ago) with BR backs and sides as an option. "Old growth pre-embargo" or some other such disclaimer. The custom shop could put some to use.
It is my understanding that Brazilian rosewood back and sides has less tendency to feedback through microphones and PA system than Indian. I know of no measurable benefit to using BR on a box with a pickup.
In my past life (before my hearing began to deteriorate) I spent some time with guitars that cost more than my house and can say, in no uncertain terms that Brazilian rosewood has a depth and tone unmatched in
most indian rosewood. A tone definition and punch that, at one time, I could hear. Sure, a nice tight indian back will out perform "highly figured" (stumpwood) Brazilian, but in general, Brazilian has a tone superiority that is (quantitatively) similar to the difference between Adirondack and a Sitka top.
It also smells better.
Until 1969 Brazilian rosewood was standard on on a Martin (21 trim and up) and other domestic guitars. My '69 D-18 has BR fingerboard and peghead veneer. It was no big deal. Throughout the 90s, Brazilian was a luxury, but not uncommon, upgrade available from the custom shops in Nazareth, Santa Cruz, Austin, and Bozeman.