We shouldn't have the brifter vs. integrated shifter argument....again. It is what it is. Both communicate the idea fine. I prefer brifter, I also prefer derailer instead of derailleur, poser instead of poseur...ect. Whatever.
Downtube shifters are inexpensive, intuitive to use, easy to set up, rarely ever go out of adjustment, you can dump the entire cassette in one motion, which helps when you start going up a really steep hill and didn't realize it....in other words, you weren't paying attention.
Brifters have a clear advantage by putting the shifting levers/buttons right under your hand so you don't have to move them. Also, the new hood shape from Shimano is awesome and the front shifting of the new Ultegra and Dura Ace is really awesome.