One big difference is that many older RC papers incorporated developer in the emulsion, and Ilford and others have ended that practice, as it was a source of instability.

Outgassing is still a consideration. The problem of "silvering out" isn't delamination--that's a different issue, and it is detectable more or less at the time of printing. Degradation of the emulsion that shows up as "silvering out" is something you would discover years later, when you may or may not have the negatives anymore.

I do treat RC prints that I want to last in Sistan, and this is supposed to help, but I still don't think they look as good as graded fiber prints.