With respect to additives and "weaker" 30 wt oils, my main concern would be MOFT. I did some quick checking to confirm what I have been seeing, and Honda is the only main manufacturer that recommends a 10w30 as the "standard" oil. Kawasaki, Suzuki, Yamaha, BMW, Triumph, Ducati, KTM, Royal Enfield, et al recommend a higher top end rating (xw40, xw50, etc).
Honda does not "do" anything different than the other named manufacturers in manufacturing their bikes, such as bearing tolerances where MOFT particularly comes into play. To my mind, it's purely a non necessary requirement to run that light of an oil from any mechanical wear advantage standpoint (colder temps not withstanding), and may sacrifice some things in the long run compared to a 10w40, 10w50, 20w50, etc.
Agree, more modern additives (boron, moly) do the same work as traditional (zinc) so not worried about that in the grand scheme no matter what oil weight it is.