Interesting discussion so far. I'll bite.
Its probably a little different for my brigade, as we have the Rescue truck, the Urban truck, the Rural truck, etc, all with rather defined roles. eg: The pumper rarely turns out as primary to a scrub fire...
Within this framework, I wear PBI to everything, unless I am on one of our rural appliances that has no BA stowage. As far as PBI +Lvl 1 is concerned, the looks may not be great but its functional and as the CFS dropped the ball on PBI I'm happy to wear 1/2 - 1/2, and preferably, just PBI pants and T-Shirt.
In terms of dropping the ball, CFS had a really great opportunity to introduce a lightweight, long sleeve, cotton work shirt to be worn (a la MFS) with the PBI when the conditions dictate that full kit is not required. This helps to combat heat stress issues and looking mildly retarded in a lvl 1 coat, while still maintaining the level of protection necessary for both rural and rescue incidents.
I believe that the CFS minimum PPE for a rescue job is Lvl 1 turnout gear? Correct? Then, our problem is solved. As long as you are wearing something that meets or exceeds the standard, there is no issue. Its like Splash Suits and Gas Suits. As long as you have the minimum, you are only making a choice to increase the level of protection you have. I don't believe that PBI provides any greater protection specifically at rescue incidents and if anything, I think it's bulkier, heavier, hotter and a general pain in the arse as far as rescue is concerned. At work, 100% cotton pants and shirt (+gloves etc etc) is the minimum for any rescue work, and at MVA's the only person in their full turnout gear is the bloke providing fire cover.
I'm all for firefighter safety, but I really don't really agree that going down the path of 'PBI provides better protection at MVA's' is the right way to go, especially when countered with the heat stress argument. The weather protection it gives is great, and wouldn't be an issue if the CFS made raincoats a standard item that didn't need to be fought tooth and nail for.
That said, I do wear my PBI for rescue work, I find that the pants are more comfortable, more durable and more padded for my abused knees. I try to ditch the turnout coat asap, but hey, bring on the work shirts.
Don't forget that the old L3 nomex, was never a complete L3 outfit. Only the turnout coat had the liner...
(unless you are super special or lived at STC)
Cheers!