You say thank goodness, but I don't know. Having an immediate emergency medical support kit in your armor is pretty nice. I suppose it depends on how much you get shot at, or set on fire, or blown up, but that's at least three to ten times a day for me, at least prior to coming here.
Ours is tuned to individual frequencies, it basically cracks the Gel and allows it to be peeled off and out like a cast. It's already sealed and closed off any open wounds past the initial application by that point, so then the only process really is reattachment. I'd be dead without the stuff probably if I hadn't had a single use in my armor when I'd crash landed here.