2s on / 2s off would completely disable all of their functionality until the interference was gone. And possibly much longer - they are finicky.
I would absolutely support consequences to any device manufacturer if a death is caused by a jamming of unlicensed frequencies. (In my opinion, medical devices should be able to keep you alive in any jamming scenario if feasible. But using licensed bands is just bare minimum.)
Additional paperwork reduces the likelihood (in actual, observable practice) that unintentional interferers exist to impact your critical-to-life application.
Furthermore, by moving your critical-to-life application away from common frequencies of interest, you avoid being collateral damage to jammers targeting unrelated applications.
Counting my lucky stars I don't need one, but if I did, I don't think I'd rely on it if it's that incapable of staying up.