For me, a porter is about the caramels and too much hop aroma interferes with the beer. If you read the threads about the early attempts at CDAs, you find that many people feel the same way, dark malts and hoppy don't play well.
There is such things as india porters. It was in a recent issue of beer advocate. Apparently only the higher ups really drank ipa while the fighters drank hopped up porters. Don't quote me on the facts, its been a while since I've read it.