MoonSong
Rules-lawyering drama queen but not a munchkin
My argument is simply that "what's core" shouldn't matter. "What's available" should be the metric used to make the decision.
If your favorite classes aren't present in PF2 in 2019, and you don't want to switch because they aren't there, that's fine.
If your favorite classes are available in an expansion book in 2020, and you still don't to switch because they didn't make those classes in the core book, that's a crappy argument.
It all depends on context, it isn't a clear cut black and white issue. In this particular context doesn't matter that badly. But for example, in 5e what's core and what isn't does matter. I still can't have an aasimar divine soul in AL for example, because neither is core!
Core matters, some DMs play with core-only. Some groups demand core-only. Core classes/races receive more attention from devs. Core shapes in what way the edition will unfold. By the end of 4e sorcerers had barely started to come on their own, but core classes had nowhere else to go, so they never received any serious weapon powers for example, they also got very little weapliment support and got completely ignored for rituals. Another example bards in 4e, they where a bit better, but by not being in core there never was a perform skill, so wizards were better at bard rituals than bards!
I really think that not making Witches core was a mistake. I'm still completely in wait and see mode. I like some of the stuff in PF2, but a lot of stuff rubs me the wrong way, it feels rigid and clinic like 4e, but without core competency to go with it. Nothing I couldn't get used to, but I need to see how they handle my favorite class first to see if it is worth it.