Of the commercial versions I've tried, some are hoppy with just a hint of roast (Victory Yakima Glory, Otter Creek Alpine Black IPA), some are balanced between roast and hops (Heavy Seas Black Cannon, Widmer Bros Pitch Black). Magic Hat Demo is even more roast-forward, and it's really more like a hoppy porter to me.
To me the whole India Black vs Porter categorization is sort of like IIPA vs American Barleywine. There is definitely some overlap in the middle.
Some people don't like it, but I enjoy everything about the combo between roasted malt and hops. I like how the black coffee type bitterness pairs with resiny hop bitterness, and I like how the roast coffee/chocolate flavors pair with citrusy hops.