Twice in the 14 or so years I've been paddling, I needed my PFD to save myself. Both times I was out in conditions that most prudent powerboaters would have avoided. Both times were in ugly conditions with an on-shore wind- I would not go that far off if there had been offshore or parallel wind just in case. Both times wet re-entry and re-entry and roll were not happening. A nice 1/2 mile swim is good for ya!
I respectfully submit for consideration, that when you need a PFD most, you don't want to worry if the thing will inflate. I respectfully submit many- including me- are not big on maintenance. The discussions I have had with those who use inflatables, is that they are require as much maintenance as a weapon carried on a ship. They must be regularly broken down and inspected. Most paddlers are not going to do this detailed maintenance and as such will unintentionally invite failure.
When surfing, if I messup and have to leave the boat I am not thinkinng "Do I want to inflate the PFD and have to reload?" The PFD is there and helps me when I need it.
While I carry a "bail out bag" that can be tethered to my PFD- I also carry a PLB in the PFD. Even out in the Everglades, I am confident that I will be picked up by the USCG before I can go hypothermic (yes it can happen down here). The bailout bag is just in case the Coasties get lost :>).
Regardless of what you are carrying if you don't have a PLB you are taking an unnecessary risk.