For what it's worth, I don't agree that "the invention" should be banned outright.
It pretty easy to find cases where the federal circuit latched onto phrases "the invention ...." when reading limitations into a claim, or when invalidating a claim for not reciting a limitation. Admittedly, those cases also cited other evidence, but practitioners are understandably leery. On it's face, the phrase "the invention" when unqualified refers to every embodiment of the invention.
I do believe that "the invention" should never be described directly outside the claims. Accordingly, some things can be "according to the present invention" and embodiments of the invention can be (and should be) described directly.
I was told to layoff the phrase "exemplary embodiment". Just describe the embodiments, which of course are examples of your invention. Give the embodiment some options if need be.