I see where you're coming from, but I think one way in which we diverge is in our ideas about what is valuable in language. I quite like inaccurate, loose formulations because they're playful - and I think writing is a form of play, as much as it's a tool to communicate with. In its place, evocative vagueness can be better than sharp clarity.

My feeling as to what distinguish good writing from bad is more that good writers say what they want. Bad writers say stuff they didn't mean to, say stuff that other people want (cliches), or say nothing at all (obscurity). So in my eyes, there's no distinguishing textual characteristic of good writing. For instance, while I generally agree with you on jargon, David Foster Wallace uses jargon in a way I really like, and think is pretty central to what makes his writing good.