I can't draw a graph here, but imagine complexity as a line going much higher much faster relative to meager improvements as a whole with a barely-raising line (and on average weighted down by many individual cases where websites have gotten demonstrably worse).

It's a shame, because the actual web platform as defined by browser APIs has gotten hugely better just in the last few years. We rarely see any of those improvements taken advantage of in the wild though. It's a huge, huge bummer.