For cutting edge html5 we have no choice but the latest chrome. Audio worklets? Webmidi? Even though I prefer Firefox they're not moving at the same rate as chrome, no one is when it comes to things like audio worklets.
To be clear, that bug originally tracked the implementation of the Audio Worker API, which went through many iterations that eventually led to the current Audio Worklet spec.
To state the obvious, not everybody has Chrome, and not everybody has or wants the newest version. That's how it should be. By implying that it's ok to assume otherwise, you're (probably unknowingly) harming the community.
Just try not to presuppose more than is required. I might be unhappy with the newest version. Or, my device can't be updated due to technical or polital reasons. Or, the newer version does not work or is not available for my hardware or operating system. Or, I might actually be on a fork (or fake) of the software that isn't up-to-date yet. You see, there are tons of reasons...
So I do have a choice, right? HN is a pretty technical forum -- not normally a place for ignorant-consumer type viewpoints (no offense intended). Case in point, my version of "Chrome" (chromium on Debian) does not auto-update (I think so - It's the normal way on Debian, although I don't really use chromium but firefox).