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Pathfinder 2e isn't number crunchy, but it is rules-heavy.

With numbers, the specifically max out the counting by limiting every roll to d20 + Circumstance bonus + Status Bonus + Item Bonus. The exceptions to this are quite rare. If you get more than one bonus of a given type, pick the highest number. So you don't get huge number stacks you have to add.

There are lots of little rules like falling damage, or grappling rules, or counterspelling, that are generally easily referenced with robust fan-made officially sanctioned reference tools.

People who tell you it's less complicated than 5e are lying, but its core elements are super elegant and play really well. Expect a tactical game in combat, nicely streamlined exploration, and lotsa fun choices for players to make during chargen and during combat