For what it's worth, here are my thoughts on the subject. I have a narrow (just wide enough for two vehicles with a tiny amount to spare) country lane near to me, which I drive down regularly. It has a 40mph speed limit and a solid white line painted on the nearside in both directions. Quite regularly, an oncoming vehicle will straddle the middle white line and encroach on my side of the road. This tends to either be a larger vehicle, a Transit van say, or a car being driven by someone who thinks it is twice as wide as it actually is! Because of this, I tend to drive with my nearside wheel on, or slightly over, the nearside white line. This, as I see it, presents two possible points of danger; I may scrape the tip of my nearside wing mirror on the hedgerow, or I may have a head on accident with a van coming the other way at 40mph. If I don't turn off the RDMS, for some reason best known to itself, the system thinks the head on accident with the forthcoming Transit van is the better option and tries to drag me over into its path.
As far as I am concerned, the system is not only useless but downright dangerous. It is not, by any means, fit for purpose. The ability to turn it off permanently should be the absolute minimum requirement, imho...
I treat RDMS as a driver aid. I dont expect it to position me in the correct position on a country road and certainly not for it to stop oncoming vehicles being in the 'wrong' place. (LKAS helps keep you central in a 'lane markings ' but thats something different used in different circumstances )
But what is correct position on a narrow road? Opinions on this vary, often depending on whether or not you have studied advanced driving manuals and techniques. Its obvious on a very narrow single track lane. You stay in the centre and fully expect an oncoming vehicle to be doing the same. If oncoming drivers meet at too high a speed thats entirely due to driver error. (By one or both) RDMS is happy to accept verges very close on both sides at once ,and in most situations you will be driving too slow for it to activate anyway.
But where its just wide enough for two vehicles to pass its different. Some drivers will rigidly follow the basic highway code rule of keeping left , but do so even when its not necessary. The downside is they are very close to the nearside hedges ,roadside ditches etc and get a much worse view of approaching hazard, that may be round a bend, or could very suddenly emerge from the side. They have very little time to react and limited option to swerve. Its easy to visualise the hazard of a car door opening if you pass too close but it also applies to vehicles suddenly part emerging from a side entrance, farm animals, pedestrians etc etc.
Side of the road huggers tend to see the oncoming vehicle that much later, and it takes them more by surprise. Their reaction is more reactive, less proactive. They have less time to slow down and position correctly to pass, so its more likely their hasty move even closer to the hedge/ditch will be at a speed that activates RDMS intervention, which in turn takes them by surprise and might cause 'slight panic'.
The whole essence of good driving is giving yourself more time to think and react in the best way.
Turning off the RDMS does not mean you no longer have encounters with oncoming vehicles . But you no longer get a warning that maybe you should be dealing with them better ,especially if you are that near disaster you feel unable to override a slight steering intervention.
Advanced training manuals tend to advocate positioning a bit further to the centre when possible. (eg there is nothing oncoming, or trying to overtake. ) Observation and hazard awareness skills need to be well developed .Its true that some drivers take the space without the skills to go with it.
