Jan 31 2019
There is a clear benefit: >8-bit depth with lossy compression for when a 90MB 16-bit lossless tif/png is overkill. The server always returns an error when I try to upload a large 16-bit tif image, and png is slightly smaller so it works but the metadata is lost. The upcoming jpeg-xs codec should support 16-bit as well so it would make sense to skip jpeg2000 and implement XS.
Jan 6 2019
I think T142243 ([EPIC] Add open graph meta tags) might be most relevant, as T19503 (Provide metadata support on Wikimedia Commons) may be more about providing external data (s.a. that linked through WikiData) rather than what's on the image page (and it makes no mention to the open graph protocol though that may be irrelevant).
Dec 7 2017
Thank you for your impressive work!
It is uploaded using the UploadWizard
Is the sha1 checksum of your file 170bb587605d926667aedcfc7cb82fd82e72c207?