That sounds perfectly logical.
Often times, the 3D printing community is the blind leading the blind, and sometimes certain things that appear to work (or make some logical sense) becomes pervasive, and when you see the same guide/advice repeated through the Internet, I suppose it is sensible to assume there's some truth. But that doesn't mean it necessarily is!
I admit I didn't put a lot of thought into it. I was printing some guy's puzzle box and everything was jammed up. He helpfully had a test print and all signs were pointing to over-extrusion. I found one of many guides and calibrated e-steps then did the single-wall cube test and ended up with my ~85% settings... and the puzzle box worked. Does that mean my settings are right? Not necessarily. Perhaps he subscribed to the same flawed logic and has his set to 85% (or whatever) and tweaked his designs for that result. Who knows?
But I am happy with my current settings other than this stringing, which I'm also now happy to report I've resolved. I had my retract distance at 2.0mm as you noted, and I often saw advice to start at 2mm and adjust by 0.1mm as needed, but nothing really said which direction. I suppose I thought if zero meant bad stringing and 2mm was a good starting point, that the proper direction would be to go higher. I tried 3mm, 4mm... nothing helped.
Finally I printed a tower just now with 2.0, 1.6, 1.2, 0.8, 0.4 and 0... clearly there's a winner!
So really, my problem is solved. It wasn't the question I asked, but I'm good. And I very much appreciate your assistance!