These things _are_ function colouring, but they show function colouring isn't scary or hard.

The original function colouring essay was much more about JavaScript's implementation than a general statement.

If JavaScript had exposed a way for a synchronous function to call back into the runtime to wait for an async function to complete, it would still be just as coloured, but no one would be complaining about colour (deadlocks yes, but that's another kettle of fish).