So, Titan Slinger is a halfling ancestry feat which let's them increase their size of their weapon die when they use a sling against a large or larger creature. Not a bad benefit.
Unfortunately, in PF2 the word "sling" could refer to a weapon group or to one specific weapon weapon within that weapon group.
So, could a halfling with the Titan Slinger feat apply the feat's benefits to a halfling sling staff, since it is a part of the sling weapon group? Or does it only work with the specific weapon sling, which is a part of the sling weapon group?
Sometimes I wonder if they learned anything from pf1... I'd say, "it only work with the specific weapon sling, which is a part of the sling weapon group".