i mean, a bunch of other people have explained it as something along the lines of "the canisters have basically no expiration date, so we still use the ones that used to be used during the second war"
i don't really see how saying that could mean you lose your job (unless there's some shady stuff going on, i guess)
oh well you'd just have to play a bunch of characters and see what is strongest
or watch videos about optimizing characters. there are a bunch of those (a couple of youtube channels i'd recommend for that are swingripper and mathfinder)
you take a feat that gives you stuff related to other classes (multiclass archetypes) or just more specialized stuff.some of them require certain things, like the wrestler dedication feat requires you to be at least trained in athletics, or like the new necrologist, that requires you to be a spellcaster that can cast summon undead
and then there are class archetypes (not to be confused with multiclass archetypes), which are subclasses you take at level 1 and at 2nd level you have to take the archetype's feat
and like prestige classes, they seem to add a bunch of archetypes every new book they release, which is not at all an issue because that means MORE OPTIONS! and i love that
the only downside is he now knows everything about your group, and could turn into a supervillian