I agree that when the poster is given the id & little else it may not lead to learning.
However, when “we who know” offer some ideas in the comment or id box on why it is what it is, (or might be) then there’s an opportunity for learning.
To do this effectively we need to judge, from the poster's activity tracker, at what stage they are at; then we can offer appropriate help.
But that takes time.... so we do what we can with the time that we have.... responding at any level has to give us satisfaction too.
Edit. Just a bit later I came across this post https://www.ispotnature.org/communities/uk-and-ireland/view/observation/786414/duckweed-leaf-miner-walks-on-water
where the comment trail is as bluebirdresearch says Fabulous.