I found a question about a student visa that was closed as off-topic. Someone commented “your question is about immigration and thus off-topic”. I would agree with that sentence — but the question isn't about immigration, it's about a temporary visa.
I was surprised to realize that we now have a close reason that reads
"Questions about immigration or moving for extended periods of time (studies or employment, among others) are off-topic. See the meta post Is it OK to ask questions about migration?."
The part in bold doesn't seem to agree with prior consensus. The most upvoted post I can find on the subject is
Expats are often simply medium-term travelers; thus expat questions are on-topic here.
It's not even clear to me that a student counts as an expat — if “expatriates (…) are moving their entire lives to their new location” while “travel implies a (usually relatively short) temporary visit to a new place”, under what definition does moving to another country for a semester of study or even for a degree count?.
How did we go from there to the following, which mixes immigration with medium-length stays?
Any questions about immigrating to a country, or moving there for extended periods of time (e.g. for studies) is off-topic.
The on-topic list (formerly faq) is not very clear: it allows “working while on the go” but not “work visas”, and I have honestly no idea where student visas are supposed to fit there.