I would expect that it is the lens manual that describes how it works, not the camera manual.
With regards to your nasty question, no I do not have a degree in sophistry and I am not a politician.
On the other hand you seem to be one as you put words in my mouth. I never said that it was stupid to download the manual, you said it. You also claimed that the camera is difficult to operate yet when asked specifically you move the subject from the back to the lens, then the tubes, etc. You also said it is easy to take photos on the backing paper yet never explained how this can be done. It is all there for everyone to read.
It was an inquiring question, just like your statement or question about my RB67 kit earlier.
I did not say it was stupid to down load the manuals I said you said it was stupid to down load the manuals. That is how I read the meaning in your text.
And I do use the RB as a P&S, so your phrase was false.
The camera came with two manuals a camera and a generic lens manual.
There were specific manuals for the 140 and 150mm, but Ive nor seen either.
The use for the 55 and 65mm may be described in specific lens manuals but I got (both of) my lenses new in box from shop and there was not a manual for either. The shop may have been wayward, but in the down load versions of the camera manual.
The MamiyaLeaf ProS PDF (for the camera)
page 23 has the old focus scale without the 140mm lens scale, my camera has the new focus scale, its serial c176xxx, the new scale came with some 140mm lenses, but would/could have been fitted new to late cameras, or on factory repair.
Page 24 implies that the 127mm lens has a depth of field scale like my 90mm has.
Page 25 caveats aperture used for close focus with the 55 and 65mm lens.
Page 26 notes 6 and 7 caveats use of 55 and 65mm lenses and tube 1.
(the Butkus site has a generic lens manual)
http://www.cameramanuals.org/mamiya_pdf/mamiya_rb_lenses.pdf
My lens manual seemed different in that it referenced specific lens manuals for the 150mm and 140mm but '85 is a while ago.
(note this is an earlier manual then mine from before the 65mm had a floating element, and both my 90 and 65 have a different profile.)
The answer to your last point is it is easy to miss thread 120 film if it is too dark to see the threading arrows, I now carry a flashlight in my RB gbag the same way I carry a screwdriver in the blad gbag. When you get home and into dark room when you find the film is not wound inside the paper (like normal) but outside the paper you know you have made a mistake, donno what I did.