my dw and i have the same battle; she rinses, i don't. i think it washes away flavor, she says it reduces calories.
i don't know about the technicalities of the starch/sticky thing with sauce, but it would seem wet noodles would absorb sauce less. (although, wet noodles can be fun
with the right person, especially lasagna)
another conundrum: you are "supposed" to toss your pasta with the sauce to let it soak in, but i actually like the starchy contrast of a few pieces of un-sauced pasta on the edges of my dish. kinda like eating chinese food the right way. the rice is served on the side, not buried under the entree. the starch, in this case rice, contrasts or offsets the flavors of the main dish. it's sort of a baseline component of the "symphony" of the tastes of the meal.