Stickypaws; chapeau!
You are so right.
Maybe as an aftertought, when you are going for service.
Think also about the position the service manager is in.
If he really doesn't have knowledge (very possible and very sad) of your problem, the simplest way to react for him is to act if the problem is not there at all.
Very wrong, for sure, but understandable.
You have to think something up to get him on your side beforehand.
You need him as an ally to get anywhere.
A sad circumstance, for sure, you have a problem and now you have to find an ally as well, no one is coming for the rescue. Well it is like that in the auto indiustrie.
On topic of your problems, 6 years ago there was quite a lot of termoil about the handling of the E60 malinfluenced by the RFT's. So what is going on now is another kind of the same settling in of a new model.
Personnely I think (I do not know) that quite a lot of the problems with the steering is about tires and suspension regulation. Not all that knowledge will be around at all dealers the first year. Not using RFT's might be the solution to much of these problems. There are quite a lot F10 drivers to have reported there initial problems (as in this topic) are solved.
It looks a bit grim talking about al kind of legal actions from this side of the ocean.