The point of Inform 7 is to make writing IF accessible to writers who are not programmers. At it's best, describing the geography, fixtures and objects, it lets the game maker think in a far more literary way about the world she's creating. By contrast constructing a list of interlinked data-structures can exercise the logical brain whilst turning off the creative one.
If you're more a programmer than a writer, then Inform 6 probably is more comfortable. But hey, Inform 6 didn't go away. It's still there in the Inform 7 IDE. And there's all the other tools such as the Skein that makes the Inform 7 IDE such a massive step forward on the old text-editor approach.
I quite like their concept of credit where credit is due with extensions. Too often the public domain world is full of takers that don't even recognise the work that others have put in. If you resent having to type the name of the author of an extension, once per game you use it in, then it's fair to say you don't deserve the gift you've been given.
It's fair to say that Graham Nelson and friends did a fantastic job on Inform 7. They are due enormous credit.