Here's my $0.02, FWIW...
Raven, to me, is the pinnacle, so far, of Wilson's solo work. Just to my ears, according to my taste, etc. YMMV.
Hand was a bit of a fall-off from Raven. 4 1/2 was a bit of a fall-off from Hand.
Bone sounds, so far, like a fall-off from 4 1/2...
At what point does the fan cut bait? Send that money elsewhere? It can be hard to make that decision in the moment.
Hindsight is 20/20, as they say. There is lots of deserving surround music out there right now.
I'm probably going to sit this one out, pending reviews and prices. We'll see