Yep, and for such cases it is usually very easy to make it work properly, if only a web developer put a little thought to it. We have most or all of the tools we need in HTML and APIs to make it work regardless. Like for example for the happy customer counter one could easily have a noscript fallback, that uses the number one already needs to retrieve to show the animation, but puts it there immediately. Then, iff JS gets executed, one can still animate the shit out of it.

It is part of what distinguishes actually good web devs from move fast and break everything kind of people.