There's also studies on load times impacting conversion rates (which mostly matters at scale i.e. Amazon).

At the same time - quantifying this is not straightforward and companies mostly ignore committing resources to such activities.

Load time is true but have been solved a long time ago, you can easily get JavaScript to load your tracker scripts after the page has been fully loaded so that the visitor doesn't have negative experience.

In these terms it will also be a labor cost to turn it off. That cost might be higher even if amortized over a long timespan.