I agree with this, and I would recommend the caveat that it is a good rule of thumb at the level of the sentence but probably not at the level of the paragraph. Wordiness in sentences (all else being equal) is bad. But a lot of expository or informal writing benefits from having roughly the same thing said in a few different ways, if it can be done in a way that doesn't seem overly repetitive. You never know which angle on your point is going to make it click for someone.