Hi, good evening, and let me share some thoughts on this

Well put post, by the way, you explain your thinking quite well
I think you've pretty much hit the nail on the head when you're talking about the "value" of precious metals and their use *during* a SHTF scenario. Whilst the actual crisis is on, those who have goods such as food and water will be unlikely to trade these goods for fiat, or gold, or silver,
unless they purposely stored extra with the idea of trade in mind. This too, though, will all depend on the expected duration of such an event, something that won't be clear on the first day(s) but may become clearer as the event progresses.
That said, if you are preparing for a SHTF scenario, one (well, I at least) don't plan on using PM's to trade for food or water - those supplies I need to keep myself fed, and those I care for fed, are part of a separate preparation plan that has nothing to do with precious metals.
The true value of precious metals will be seen *after* the pieces are picked up from the SHTF event.