That's kind of an extreme take on what I've said, and it takes a bit of a leap to get to your "under that logic". The adventure IS good (IMO, naturally) because of the sum of its many good parts. They absolutely could NOT have "written anything" and still have it be good. It has a bunch of small problems that are easily fixed. (Yet again, you can see them as big problems if you chose to, that's all fine, I just don't). Every adventure I have ever read has things that I don't like about it. That's not because they're all bad (some of them are bad), it's because it's not possible to write an adventure that will be all things to all people.
I personally agree that the idea that Icewind Dale has had no light and a -45 average temp for 2 years, as the module appears to say (yet while showing otherwise) is a bit too much for how I'd run it, but I also think that those sentences are a very minor detail in an otherwise very good book. (There's other things I'd change too, like the speed of travel by dogsled and just how dangerous falling into water might be, and yet those are also still minor things).
This is not to say that I don't think that it's possible still to make better D&D books than this one. I think it's one of the better ones, but of course, there's still plenty of room for improvement. I'd be surprised if the people who wrote it thought that it couldn't get any better.