I'm also making an assumption that Toyota is behind the curve, it could just be a temporary situation because of a demand spike. I am on the list from Helm when they come back in stock and so the list may just be growing until they get enough on it to do a print run. Toyota is all about just in time, so no sense printing a bunch of 2-inch thick manuals that will just sit on the shelf for 5 years. My guess is most dealerships have the manuals as electronic files and it's just knuckleheads who still want printed manuals.
"Silent enim leges inter arma." -- Cicero