Personally, after lurking here and being a former member (and Chairman) of the SAE Fuels & Lubes committees, the reduction of Sulfur is a good thing, regardless of engine type. Sulfur, when introduced to the crankcase (blowby) and combined with water (condensation) and heat, creates Sulfuric Acid; not a good thing for bearings, seals, etc.
The statement(s) that there are minimum lubricity requirements established for fuel is correct and the SAE recommendations are usually, if not always, adopted.
The only additive I use is basically a "Feel-good" measure to address bacteria and algae when storing over the winter.
Bob (Squidly Down Under) & Peg - 2013 Ford Focus pushing a 2011 Phoenix Cruiser 2552S
"In God we trust" to preserve our country and bring our Troops safely home.
Carry on, regardless..................