Why the delay. I can only speculate but it seems to be that the higher-ups at Microsoft do not want this data in the hands of site owners. I suspect that the click-through rates that Bing Chat would show site owners would be horribly low and Microsoft does not want that data to get out to the public.
There could be technical reasons why it was not released but from what I can tell, this feature was ready to go and Microsoft Bing decided intentionally not to release it. Why? Like I said, publishers and site owners were concerned about AI answering questions well and full enough that users would not need or want to click over to the source.
Why we care. We were hoping that Bing would step up and share this data in a transparent manner. We were not expecting Google to do the same with Google Search Console. But Microsoft Bing has been more transparent with Search and Bing Chat than Google has been with Google Search or SGE.
It is sad to see we are now a few months since Bing teased Bing Chat data in Bing Webmaster Tools and Microsoft won’t comment on this feature at this point.