Page Speed Insights is a great tool but too many webmasters become too obsessed with this automated tool.
This tool was designed to help webmasters make urls faster. It wasn't designed to give perfect and smartest speed improvements to every single url in existence. I wouldn't worry about following every single recommendation they make. Several of their recommendations may only make a negligible improvement to page speed. You do not need to score 100% on page speed insights so do not worry about trying to achieve 100% score.
Focus on the general concept of making your pages as fast as possible which improves the user experience. At a certain point your efforts are better spent improving the value of your content instead of recoding or compressing something to save 20 bytes or .003 seconds.
Try to get all green lights in Page Speed Insights and don't obsess with needing a 100% perfect score.