I have always been the traditionalist of pulling the pin. Chipping I'd leave it in, putting it even from the frog hairs, I would pull it. But why? It was conjecture and feelings - until I saw the data reports from MyGolfSpy. There are 2 sets of data - stiff flagstick and a flimsy flagstick. I imagine you can make your own determination of which is which, and actually you want a rigid flagstick as it turns out.
Below is the data from the extensive testing, and it is undeniable that leaving the flagstick in is a true advantage. I'm not saying I can easily get used to it or even like it but this is what it says.
Now... having said that, I am still curious about 1 thing: I have seen times where if the hole is cut on the side hill of a green and the pin is seemingly leaning to one side or the other, is it still true of the below data? Putt breaks right to left from 10ft away, you're easing it in on the right side of the cup but the pin is leaning to that side so it isn't an equal distance away from the cup on both sides.
Thoughts? Are you pulling the pin? Would it affect your confidence in the putt going in?