Are you more comfortable with the location of the goal posts now that you have moved them somewhere new? The OP does not mention gaming. Your "definitive" answer talks about a tiny niche within FPS gaming which itself is a niche within the submarket of gaming. For your 0.001% niche, the 1080Ti isn't worth it either because improved image fidelity is counterproductive. For everybody else, the 2080 Ti is a massive improvement.
You're right I should have specified this is not work-related upgrades. In all honesty that won't matter much though, I appreciate as much feedback as people will give!