Except Temporal is not, in fact, out.

https://caniuse.com/temporal

The current global availability of native Temporal is 1.81%. For context, IE11(!) has a higher global usage than Temporal has native support. For my organization, this likely means we're years from being able to use Temporal in production, because getting the polyfills approved is such a hassle.

Keep in mind that even as of December last year, Chrome didn't ship with it yet (i.e. support is less than one month old). Safari still does not.