Every Indian recipe I see seems to insist on rinsing basmati rice before cooking it. Why, I have no idea, because I never rinse it, yet I can discern no difference between my rice and rice cooked by other people that have, presumably, spent the extra 15 minutes rinsing.
If the stickiness is the difference, as suggested in this thread, then I would suggest that not rinsing the rice would make eating rice-based thali a lot less traumatic because the grains would clump together more easily.
Best Answer
Basmati rice is supposed to flow freely though, if it clumps, you are using it against the norm and should probably stick with a stickier rice.
Usually Basmati is used Pilau style, or in a Biryiani, then the grains are slightly coated in some form of fat (oil, ghee, etc), so the starch you would definitely want rid of.