At the risk of stirring things up again...
I have a SIB. I think most people would agree that SIB's are rather wet boats and you expect to get wet - or at least wetter than a RIB.
I've always had foam LJ's or orally inflated only (no gas canister). I recently went through the process of assessing which LJ to buy for myself and decided that for my purposes a hydrostatic style probably would have suited me the best, however unfortunately the costs were prohibitive.
The auto's for me would be pointless, I have waders to launch and regularly get chest deep in swell and don't like to go into the water without a LJ or PFD of some description as wading out over rocks is going to be one of the most likely times I'll fall over and drown. Equally when underway I'm not bombing around at anywhere near the rate you guys do, and the most likely time that I'll go over is during slow manoeuvres, of which I'm in control for so am the most likely one in the boat to expect bumps etc. I do however frequently get spray which would also likely set off the auto's.
In the end I decided on a manual as a compromise. Much better than orally inflated, less bulky than a foam, less likely to go off unexpectedly in spray/while launching and I can actually afford it. (cue the "you shouldn't put a price on safety equipment" posts)
I do however still have my foam LJ, and I always issue foam LJ's to guests who come out with me. These are people who generally have never been out in a boat before, plus the foam keeps them warm and makes them feel a bit more secure. If the weather is particularly manky or cold then I'll wear the foam instead of my manual.
My risk assessment concerning my life - I've made my decision based on practicality, and it affects my own life only.
My risk assessment concerning other's - I've made again based on practicality. I'm giving them the most reliable form of PFD that they don't have to do anything with and keeps them warmest and happiest.
I believe that all (almost) products have a place and purpose. Nothing is ideal for every purpose. It's getting the right product for the right purpose that matches your acceptable compromises that's the challenge.
What I do isn't meant to influence what others do and is my choice. I'm merely explaining my reasoning.