OK, I just realized Sorcerors get Expert Simple Weapons at 11, but neither Cloistered NOR Warpriest ever gets it.
I'm not quite clear on the situation with Unarmed, I know it's supposed to follow Simple but if that doesn't progress would Unarmed?
Maybe not, since they do get Trained Simple it just never progresses...?
And if it did progress, it would need to progress with Deific Weapon since that is the only thing that Cloistered/Warpriest do progress,
and then that would leave Deific Unarmed/Fist not really uniquely progressing anything.
Smells fishy to me, ESPECIALLY for Warpriests (whom I think have other mechanical lacunae) although it's also weird Cloistered do get Simple Trained yet don't progress that while Wizards do progress multiple weapons that are subset of Simple. Just feels like inconsistently implemented concepts to me...
As far as I can tell this is right, Clerics don't progress unarmed unless your chosen deity is Irori, in which case you progress Fist as a specific weapon, but probably not unarmed attacks as a whole so you lose proficiency if you try to use an alternate form of unarmed combat like monk stances.
(Unarmed strikes are generally going to be bumped up to follow simple weapon proficiency, although it's not exactly that, so Clerics might get expert there.)