Airpods 3 AAC-ELD for Facetime only?

The promo for the new Airpods 3 claim AAC-ELD to allow better audio quality with Facetime. However, there are a few open questions concerning that claim:

• Does this only apply to Facetime on an iPhone or would it equally work with Facetime on macOS?
• Does it only apply to Facetime or can this codec also be used for two-way communication (mic and speakers) with other applications such as Slack on macOS? (In other words, on macOS, when selecting the Airpods 3 for input and output, will AAC-ELD be used or fall back to the rather crappy SCO codec?)
• Airpods 3 lack ANC which is an extra feature of the Airpods Pro. Is it correct, that the current Airpods Pro do not support AAC-ELD at all and in order to get both AAC-ELD and ANC, it'll take some patience to wait for the next gen Airpods Pro?

Thanks for shedding some light on the matter!