I’m gonna say posting screenshots is kind of parallel to the purpose of this place. Lemmy is an aggregator, a platform where content from other sites is linked/reposted.

Original content is still important, as without them, the website would die in a few weeks. But we should not ignore the value “crossposted” stuff adds to this place. I read a lot of great, original stories under the thread shown in your screenshot.

!science_memes@mander.xyz is a perfect example of this. It is filled with unoriginal content and screenshots but I genuinely learned more stuff in the comment section of that community compared to “serious” science communities in other platforms. That also has something to do with the quality of fediverse users of course, but my point stands