A player in the game I am currently GMing has asked me whether there are any weapons that have the Grapple trait. I read the Equipment chapter and, unless my eyes deceive me, could not find one that had such trait.
Are there any weapons that currently fit that criterion or is the trait there for future weapons?
It's futureproofing, probably in anticipation of nets and mancatchers.
They might also have it for archetypes and feat chains. I think there were a few effects to do grappling or grappling style effects with weapons in PF1, and it isn't too hard to imagine a feat that just says "[insert weapon here] is treated as having the grapple trait".
Maybe something that lets you impale an enemy on a spear.
You can steal my homebrewed Mancatcher
Mancatcher, D8, B, 2H, 2 Bulk, Club Group, Non Lethal, Reach, Grapple, Shove, Trip, 2gp/16sp (Since I made my own stuff when we were still using sp)
More based on the idea of the modern version the police use in some countries, because that whole spiked version...