[jrpt]

Companies derive so much value from third party JS that it's pretty much impossible to not use any third party JS. There's some paper on it that I can't find right now but the average site has dozens of third party resources and the number increases with largeness (more popular sites, which correlates with larger companies, tend to have more third party dependencies) and over time (it was less ten years ago). It's not just third party libraries embedded in their code, but products they're using on their site.

In general I agree that you should minimize unnecessary JS, especially simple libraries like the "left-pads" of the world.