i agree completely! defibs are kind of useless right now because epi-pens can do the same, that is, get a living person out of unconsciousness status.
defibs need some unique ability in order to make them worth carrying around. let them revive dead persons but these should be so weak after revive that they need all the support/food/drinks from their friends/other people otherwise they will fall into unconsciousness again (not die, unless damage is dealt)
that should be a fair trade-off.