The Kobold 5th level ancestry feat Grovel has two key benefits. The first of these is straightforward enough - it allows the Kobold to feint from a 30 foot range - an unambiguous and clear advantage.
The other component however, is a bit less straightforward - it causes the feint to work against the targets Will DC instead of Perception.
I’ve seen claims that this is generally beneficial and that Will DC’s are almost always lower than Perception DC’s, but is this true? I haven’t seen the actual data anywhere, and when I grabbed a dozen monsters at random from AoN just now, I found it much closer to 50/50, but the sample was far from representative.
So, the fundamental question is, what percentage of (non-mindless) creatures have lower Will than Perception? Because the answer to that drives a significant amount of Grovel’s value for a Kobold that isn’t trying to stay at range.