Are you using a G29?
As if that's the case it has a known FFB deadzone issue with being gear driven, one which doesn't exist with direct drive (PS only) or belt driven wheels.
G27 thru GIMX, and problem isn't wheel, problem is coders crap code on FFB, my wheel doesn't magically get zero deadzone on GTS and Dirt Rally and then when AC is started it became crap with few meter deadzone... No fingers can be pointed on Kunos/505 whatever coder is responsible this crap.
I can also tell you that a modern BMW (and I have owned and driven enough of them) do not have great communication through the steering at all, they use electric power assistance which robs you of road feel and most have very thick padded rims which don't help either. Throw in modern cars suspension bushings and you have rather numb steering feel. This is not a situation isolated to BMW, but quite common of most modern cars, you want real communication of what is going on at the tyres via the steering either drive something un-assistance or give a Lotus or Caterham (etc.) a go.
Weird, I have driven BMW's models from 2007-2016 200.000km+, from brand new up to 300.000km on odometer, seen whole process how joints get loosen when kilometers on odometer rises and I have always been excellent road feel on those, thru wheel. '16 model F10 is good example, you can feel "everything" thru wheel but in BMW standards, meaning not annoying feel, but you feel connected to road, this is during winter top thing here in Finland. 24/7/365 having long pressed stability button with two yellows on dash and gearbox on sport mode.
What you are feeling in your car is not direct from the steering wheel, its primary and secondary ride via the cars body itself, some of which you can feel the steering, but its not coming from the tyres direct to the steering.That'st tactile units on sim rigs are for, or you can use the canned effects to provide that for you should you wish.
I know difference what's coming thru wheel and what's coming from car body, one hint to you, next time you're driving car let your elbow rest against door cushion, giving you "ground zero" for feeling, then keep really gently your hand on wheel and let it speak to you, then try with free hanging hands and hand resting on door cushion without touching driving wheel, after this you know how much steering wheel speaks to you.
I have had discussion with wheel over million kilometer and it has told me lot of stories how road goes.
That you were not able to tell what understeer effects does is rather interesting in itself, take a look at the following and see if you can work it out (here's a hint GTS doesn't model it).
Where I said at I didn't feel difference, I was testing so many different combos at didn't remember what was last position on it. Trying to get game normal ffb(general) to speak that information, without luck.
Then please explain why its only a factor on the G27/G29? A wheel range with a known deadzone issue at zero degrees due to the gear driven system.
I mean its not as if people have been complaining about
If this is only because g27/g29 reason then I'm complaining on correct issue, then developer should put more time to do their Logitech FFB code working, lousy explain to say "it's Logitech wheel, don't expect it to work" because it's working without any freaking deadzones on other games, so problem is entirely on Kudos code.
Don't judge AC by how it feels on a G29
I had 10 years experience with G series wheels. Bought a G29 when I got a PS4 and AC. Hated it. Bought a T300 4 weeks later and the FF is brilliant.
Of course we can criticise the developer for not programming it well - G series wheels have the ability to run really well, just not on AC!
There was no warning text included on game which says, don't expect this to do simulation well on Logitech products. So my complain to game is well justified, crap using Logitech product, should have beta tag on Logitech support area.
Let's put manufacturer alignment on car.. Well.. Well..
Or let's not.. Maybe after Kunos mechanics are sober