Interestingly, I've seen the same argument applied as a refutation to the traditional argument that dating site profiles should be kept short and simple. Perhaps it's applicable to writing in general.
Definitely it applies to all kinds of writing, where a feedback loop is desirable, in order to establish a communication channel. In this class, the only thing specific to business writing, is that you try to establish a communication channel with a view to building a business relationship. Nevertheless, I believe there are types of writing where feedback is not desirable. When I write poetry for example, I would rather not hear from anyone who has read something I wrote.
