It's not even accurate to say CPU power has flatlined since Westmere. Instructions per cycle is significantly higher today than in 2010, so performance at the same nominal clock frequency is substantially better. Not to mention power efficiency gains since 2010.
I said it's flatlined from seeing graphs like this[0] and this[1] (again, compared to GPUs).
But I'm far from an expert here (just an enthusiastic consumer), so what you're saying is news to me. The more flowers you can lay at what looks like the grave of Moore's law, the better. I don't like being a pessimist! :3
