https://commons.wikimedia.org/wiki/File:Herrmann_Debroux_metro_-_Art_by_Rik_Poot_(1985).jpg have minimal wikitext source code, but currently used 78 templates and modules. This is bad because of T343131: Commons database is growing way too fast. We should build a self-contained information and license module so the number of transcluded templates and modules are reduced to no more than 10, and eventually only 2 (note moving Template:Art Photo and Template:License from structured data to MediaWiki namespace and calling them via int: will further reduce two template calls).

i dont know if this has been mentioned anywhere.

caption (SDC) has a fundamentally different role compared to the description field in template:information.

description can be as long as possible. users can write anything about the file into description, like what's depicted, how the file is made, any special notes of significant things, authors' notes, ways to contact authors...

caption can only be a short and succinct description of the file.

In T354016#9475096, @RoyZuo wrote:

i dont know if this has been mentioned anywhere.

caption (SDC) has a fundamentally different role compared to the description field in template:information.

description can be as long as possible. users can write anything about the file into description, like what's depicted, how the file is made, any special notes of significant things, authors' notes, ways to contact authors...

caption can only be a short and succinct description of the file.

In structured data there are another field named "detail" which is a longer description of the file (potentially containing wikilink), similar to description in Wikidata item (where caption is similar to label). This feature is not yet available.

I'll be attending May hackathon, if that might be a good time to work on this? (I can't make the NWE one.)