I would say exactly the above, right down to the brand! I put foam back in my DE in case of deadheads.
I guess I might also add that tearing out wet foam on one side of my DE (and dry on the other) left me with the belief that
A) I'm not a huge fan of foam up against exposed wood surfaces, which is just how they did things back then
B) these days you can easily get a couple of gallons of epoxy and make sure every surface is very protected
C) the side of my boat where nobody had made stupid decisions about how to install stuff later, like drilling holes in the cockpit floor to pull heater hose through, was dry. It had maybe absorbed a tiny bit of moisture over 35 years - there was a little bit of dampness below decks - but very little, simply because the integrity of the compartment was quite good. The stringers were dry as a bone.
I think a well-designed glass boat with modern, encapsulate-every-chip-of-wood epoxy construction, would have to outperform my boat, which was used as a work boat on the Sunshine Coast for most of its life, and still only got really wet when they decided to play stupid plumbing tricks.
I'm currently high on cough syrup so this could be getting a bit rambly but the point I was trying to make is that I think the big issue with foam isn't foam, it's construction technique.