Nor many mastery tree passives such as Draining Arrows.
It shouldn’t proc every single hit for things like Draining Arrows as that would be OP, but it’s odd having Flurry invalidated from being used by many synergies by Boundless Blows. It feels super anti-syngergistic and dissuades people from build possibilities. Maybe it could give a stack every few seconds, or every few arrows or some such.