Some of Page Speeds recommendations seem to go against certain design and development practices. Does Google think that only speed is important?
Since Page Speed is a performance optimization tool, its recommendations are biased in favor of speed. However, we recognize that web development is complex, and our suggestions might be restrictive for an individual web site. You have to consider the tradeoffs for your own application: some of Page Speed’s recommendations take substantial effort to implement, so you need to evaluate the cost of making changes vs. the benefit the rule would have on your page. Our goal is simply to point out the issues that you should consider fixing.