I logged into MSE only to find two handfuls of edits waiting for approval/denial. They were mostly for tag excerpts and tag wikis.
Initially, I just skipped them, as I'm certainly not an expert on spinors. But, the slew of edits clearly have something in common, they feel like they were "guided" by an external source. And indeed, searching Google for a copied and pasted selection from the proposed edit, in quotation marks, yields exact matches to Wikipedia.
I rejected a few of these (and excerpts as well, but mostly for the circularity reason), but after so many, I just wanted to make sure I'm doing the right thing and rejecting essentially every edit.
Obviously there's something wrong with copied content, as it's one of the default reject reasons: "This edit copies a significant amount of content from an external source. Generic descriptions such as encyclopedia articles and ad copy do not provide useful guidance; try creating something useful to this community specifically, and be sure to attribute the original author. See: How to reference material written by others."
And, for the excerpts, circular tag definitions as well: "Tag excerpts amounting to, "[tag] is for questions about [tag]" are pointless and usually rejected. Excerpts should describe why and when a tag would be used."
Should these kinds of tag wikis and excerpts be/have been rejected? Or are they better than nothing?
EDIT: I feel the need to mention that I'm genuinely conflicted. I'm pretty sure MSE has a fair number of blank tag excerpts and wikis, and it is an admirable thing to try and fill those in. I'm just not sure which of the "Perfectly OK / Fine, but not ideal / Not OK" categories we're in here. I'm also not solely focused on this batch of edits, although I don't think this is a very common practice.