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That's generally how that works for new things like this. It is rare for a new thing like this to be adapted by everyone at the exact same time.

Certainly within the context of browsers. There is a reason why websites like https://caniuse.com exist in the first place. If you pay attention you will also see that for APIs on MDN it will also have a browser compatibility list.

Yes I am just saying how early this is.

It is not a "watch out it may have some quirks on FF and break in Safari" early

It's "Polyfill everywhere" early

Mentioned elsewhere in this thread, but https://test262.fyi/# is great for keeping up to date with the current engine / interpreter support :)

Time and timezones are a big and complicated thing, I'm not surprised / appreciate they're taking their time with it. A library is temporary (ha) and is often superseded (e.g. momentjs -> luxon -> dayjs), but standard libraries are in it for the long time (Date has been around for 30 years and will be around for another 30 alongside Temporal).

There's a polyfill in the meantime.