Its just impossible to know everything right?
So no point pondering over it.
Some folks can buy a camera with a days pay and has spare left.
How do you want to compete with ppl like that in terms of info on cameras and gear?
Then again, its just hardware info, not software info (ie. just about gear and not necessarily on photo taking)
On the Mamiya TLR, if you like a bigger, heavy TLR, and TLR handling and look, you'd like it. I did not buy one, but handled one in a store.
Logically, with the prices nowadays for RB67 or Bronicas, might as well get those.
Not as old (so less wear and tear); Interchangeable backs (645; 66; 67); No parallax error; Easy to get filters
About as heavy and large so its a wash between them.
So to me a Mamiya TLR is a choice of passion rather than logic.
No wrong in that and they just look so good.