I agree there are often more important performance issues on sites, especially with images, but that doesn't mean we should completely ignore javascript bundle

I agree there are often more important performance issues on sites, especially with images, but that doesn't mean we should completely ignore javascript bundle sizes. In modern sites if javascript doesn't load sites then become non functional, e.g. navs don't work, some SPAs won't work at all. Whereas an image or favicon taking a long time to load shouldn't stop the user from being able to functionally view most of the site.