I have read every post here with interest. I spend my days building home sensing for older adults, and the refrain I hear from families matches what several of you wrote: the pendant works fine, except the parent will not wear it, and a camera feels too invasive to suggest.
One honest observation from those conversations is that a device left on the dresser helps no one, so my team designs for nothing to wear, no cameras, and no microphones. Dignity turned out to be a safety feature, not a luxury.
My practical take from this thread: whatever you choose, trial it for a month and check the false alarm policy before committing, because a system that cries wolf teaches everyone to ignore it.