Not really, the reason MD will last shorter is because you're body doesn't have to break down the pill binder, it all depends on the pressure and amount of binder that was used to press such pill.
With pure MD, you're getting the ingredient you want straight away.
Try chewing a pill with 120mg. Have a break, and drop 120mg of pure MD with no skin (Just the MD), they'll last around the same. chewing it essentially breaks it and removes the step your stomach does.
I don't get what the fuss is over "pure" MD, it can be cut just as easy I think. In the end, the overall effects are the same. What do you think they put in pills? Some lesser-version of MDMA, it's all MDMA in the end.
Pills in the UK now are purely MDMA I think, no cuts. I haven't had a pill thats been cut with speed or caffeine etc. Just the same as what I'd get buying "pure" MD.