This introduces privacy harm, in that it opens up new channels for communication between the site and potentially 3rd parties, over types of information not currently easily captured.
Why couldn't this be better capture server / author side with static analysis and or instrumented crawlers and / or users who want to help the site debug / improve its own site?
This should be opt in, since the primary beneficiary is the web site, and not the web user.
What information would be added to the WebExtension layer to allow extensions or similar to block Depreciation reports (independent of other POSTs / reports)?
Moving comments over from https://github.com/w3c/reporting/issues/169
This API should be opt in