Optimizing a website is one thing, knowing the basics (white- vs. blacklisting (some software even allows greylisting)) something different. I personally consider poorly designed systems a mere matter of evolution: either their design is not that important and they survive, or it's so bad and they dwindle. At least there's software that makes things a lot easier, and WordPress isn't the worst one. Stuffing bad / poor / needless plugins into WP is a common mistake. But all these mistakes are the raison d'être for a lot of consultants and SEOs, no?
By the way: the plugin 'Dust-Me-Selectors' does similar things for Firefix like Audit does for Chrome. The WordPress plugin P3 (Plugin Performance Profiler) is pretty good at finding resource hogs in your pugin collection.
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