Comment by pupppet

The problem with being a slave to these Lighthouse scores is the test is only concerned with the one page you are testing. If you assume your visitor will only visit a single page on your site that's fine, but even if they visit a second page, nearly everything it suggests you do will make that second page load slower than if you had developed the page using the traditional methods- external CSS/JS files that apply to your entire site and can be cached.