Just02, I have very little if any marring or scratching issues washing vehicles that are significantly dirtier than what's posted in your picture. After a short while working with ONR on different vehicles in different conditions, you'll learn the make better judgement calls on the limitations of this product, but I will say it's definitely good for more than just a dusty vehicle. I've used ONR with MF's, sheepskin mits, grout sponges & Shmitt's, all of which have worked well for me. I find I use a lot less water / ONR when using MF's than when using other wash tools with ONR or QEW. I don't know if it's just me, but I usually end up using way more water & ONR when using the Shmitt compared to other wash tools.
Sometimes I'm working in areas where there's fallout and ONR works to my advantage in these cases because I can wash a given panel, dry, clay, polish and protect that panel before moving to the next panel. With the traditional method of washing and drying the vehicle, the surface is left exposed for longer periods of time. If there's nothing in the air to contaminate the surface before polishing, then there's nothing to worry about. But sometimes there's abrasive particulate in the air (i.e. contruction sites, manufacturing plants, etc), and the surfaces get contaminated pretty quickly. Today for instance, there's a 2000+ acre fire nearby and the vehicles I'm working on are absolutely filthy from shoke & ashes. I can't even deliver a clean vehicle today because its already covered in ashes by the time I'm done.
One of the keys with any method of washing or drying for that matter is to use the minimal amount of pressure needed to clean or dry the surface. If I'm washing a surface that's pretty dirty, I'll simply make a couple more gentle passes rather than trying to wipe it down perfectly clean in a single pass.
And with new towels, *always* wash them before your first use to make sure they truly are clean. Just because they're new & unused doesn't always mean they're clean.