I just used up a bag of dried dates that were a couple years past the date on the bag. They weren't noticeably different from when new. (They went into something baked so also seemed less of a big deal.)
Some brands of mayo actually say on the jar that you don't need to refrigerate them. In the fridge, I'd probably keep that 2 or 3 times longer then the jar claims it should last.
Unless stored in some unusual way, the nut oils would almost certainly have been rancid. Not very healthy for you, but wouldn't give you food poisoning. Salt can hide the taste of rancid oils.
I'm not giving anyone orders, just trying to convey how ridiculously anal you have to be about it get rid of them. I went through several rounds of "surely these things will be ok, they aren't open / in a ziplock / not something it would possibly want to eat" repeatedly failing to get rid of them before finally putting EVERYTHING into glass, Tupperware or the fridge.
I would suggest the data you have is not reliable enough for this comparison. For starters, not all dental floss is the same. Secondly skill and technique may vary.
Not just sealed. They will get into sealed cardboard boxes and through thin plastic. Like bags, forget it. Everything either needs to go into glass, metal, the fridge, or thick plastic, like tupperware. Also they will eat stuff you'd never expect, like spices, even hot pepper.
Liking the content or not is missing the point. The question anyone should be asking is whether they like how the algorithm manipulates them by shaping what the content in they see.
The words have very different origins. While I think they converged for a time, they started out different.