The question Where does the use of "deck" to mean "set of slides" come from? shows research. However, it was closed with the reason "Please include the research you’ve done". Why?
I'll summarize the answers the question received in the comments: 1) The question has been reopened. 2) the last close voter didn't think but instead just simply followed the previous close votes.
- It's been reopened – Mitch yesterday
- Note that 4 out of the 5 CVs were cast before the link to Etymonline was added (showing minimal research effort) . The last CV was actually cast much later when the question was already in the hotlist, probably on traction of the other CVs. – user 66974 yesterday
As a side note, most non-closed questions on this website do not show any research and the close reason is applied very much arbitrarily.