The complexity of web standards isn't necessarily a bad thing. A lot of the "complexity" (as usually judged by the raw size of the spec) is just existing APIs evolving to be more rigorously defined. Before that level of specificity, browser implementations varied and engineers had to make certain decisions.
A more "complex" spec can sometimes make the job of the engineer simpler.
That's not the kind of complexity that is the problem though. The complexity you have to deal with is just more and more features being shoved into the spec at breakneck speed, or if they are not in the spec, it's just Google adding them to their engine and everyone starts using them anyway to the quasi-monopoly of Chromium-based browsers.