The lack of FFB explanation by SMS is somewhat puzzling. But the same thing happens with PD/GT franchise.
They don't explain how things should feel or how they should be adjusted for optimal performance. But they finagle with stuff every time they laydown an update. And those changes/adjustments are undocumented. On the GT Forum, we called them "Ninja Edits".
It seems SMS/PCars indulges in the same skullduggery. But stable FFB is a dream of mine. I suspect it will never be stable across the board because of differences between wheels, and electronic differences between computers and consoles might have something to do with it. Small variances in operating voltage might be responsible.
Hopefully SMS is actually doing "Ninja Edits". I would show they are still interested in producing a good product.
I suppose the other problem is one of human nature, if theres buttons to press, or things to fiddle with, we'll fiddle! I still mess about with my TV settings probably once every week and i've had my HD TV for 8 years! (brought it when they were expensive so can't get rid of it!!)
So PCars with all those things to mess with, added to that you'll see stuff on forums where people swear they found FFB nirvana, so you resist it, but the urge takes over "is it better than mine" so you tweek to their settings, then someone else says thats wrong, so you then convince yourself it is, so you tweek some more, one tweek in globals changes all the open wheel car feel...so you tweek again, oh but now GT cars feel too light....
And it goes on and on...give us humans things to mess with and we will. In truth call me a dumb ass console casual player but i think i'd rather a good set up out of the box and then with few settings split for fx fy mz etc with sliders for 'scale'...
Much of the issue is "what if i did that would it be better" then once you fiddle its throws spanners in works in other cars then you just go down the rabbit hole again..
Thankfully there is no real 'game' in PCars so the game becomes fiddling with FFB and driving random cars around which i enjoy...
I also wonder if SMS meant SOP and body for gaming motion rigs only, i dont use sop or body now but theres few folks on official forum using sop and body for controllers!! No one questioned them about this fact!
I think SMS like the fact FFB keeps people talking and the biggest threads on official forum are about FFB, something else i think SMS have been a bit naughty with.
Sure its something they will 'solve' for PCars 2 and will be in the sales pitch along with custom championships and better tyre model and physics..