The only real "objection" I would make is that the conclusion seems to lean pretty heavily on PIE over DEX based solely on Heavy Shot, which may not necessarily scale well as a general recommendation; if WSes do have XI-style secondary mods in this game, you'd need to use more discretion in your stat build.

As a point of reference, if a similar test were performed for XI THF and the one dagger WS you happened to pick was Shadowstitch, you would come to the conclusion that +CHR is very important; if the one dagger WS you picked was Viper Bite, you'd come to the conclusion that +ATK isn't very good.

Of course, the argument could be made that Heavy Shot is simply more important than other WSes in all situations (not just Moogle), and I'm certainly open to that. I just want to avoid projection of a "global hierarchy of ARC stats" before we find out the impact of stats on the other WSes. It certainly seems counterintuitive for SE to tout DEX for ARC and then make +DEX the least effective bonus to add.