In some part, the fall-away is supposed to remove some of the problems of grip, form & torque.

To activate with inertia (like the trap door) may sound like less trouble & less assemble. But the minute changes in form, grip, & torque we thought we may be helping to some degree, may trigger this rest at different points.

My opinion on any fall-away is that it should fall away (before) the acceleration pressure on the string comes to an end(8-10” of the power stroke, depend on draw length), so the bow does not become loose in ones hand & moves forward. This is where one may rid some of the sins of the bow hand. But this is perhaps the tug, that triggers the trap door.