Enhh.. there are quite a few things tied to size related to things like grapples and trips. It's just less tied to weapon stuff.Not just basic D&D. Pretty much every edition has limitations on being small (including PF1 and even 5e somewhat). PF2, on the other hand, treats small and medium interchangeably. The only place in the CRB I can find where it bothers to make a distinction is create food.
You’re right. I missed those because I was looking for “small” specifically, but the requirements for those actions refer to relative sizes instead.Enhh.. there are quite a few things tied to size related to things like grapples and trips. It's just less tied to weapon stuff.