The sim does take a simplified view of things. E.g. skillchain damage is not a factor, afaik. Although some gear does have its SC bonus effect listed (notably Nyame does NOT) skillchain damage is not shown in the various outputs.
Even removing all of those (more minor) bonuses like SC damage or Macc for less resists... the main comparison from a raw WS damage perspective is whether MAB+16 is competitive with WSD+12 STR+18.
Just at a glance, I wouldn't trade WSD for MAB at a 1.25 ratio - and that doesn't even get to the 18 additional STR (and slightly more MND) helping as stat mods for Cloudsplitter.
For some perspective, not all that long ago when Reisenjima augmented WSD/MAB gear was #1 for magical WS, there were always discussions about how much MAB was enough to equal 1 WSD. General rule of thumb was always something like 3-4 MAB : 1 WSD (exact ratio depending on totals in your set).
Why you list DA for magical WSs?
Shouldn't have! Disregard that. And it doesn't change the overall point at all.