(b) people might suffer through substandard products because they're the only reasonable way of developing software for a platform (you see that sentiment a lot of times from people who claim to be forced to do development on Windows)
Just saying that a single person claiming that XCode is an unusable, horrible piece of shit probably says as much as 1 million apps being written for that platform. At least not about usability of the development environment.
Xcode 5 finally makes it easy to run single unit tests. Before this, you had to create a schema to run a single test, which was several clicks and possibly some typing. Now it's click and run, which is lovely.