This is deliberate… because it's not very helpful to the author who wrote the post or those trying to figure what the heck is going on. If you read War of the Closes, it talks about redesigning the closure system to be more helpful to the author — and everyone who would accuse you of being unhelpful … about why the question might not be a good fit for the site.
It is exceedingly unlikely the author simply mistook this site as a place to ask about "bats" or "breakfast cereals", so when you say [not about Academia], it comes across a overly dismissive and unhelpful. What is it that isn't a good fit for this site?
When the moderators added some of the more-common Adademia-specific close reasons to that dialog, it removed the catch-all, generic close reason entirely. It simply becomes too easy to reach for that generic "off topic" close reason, so it becomes the most overused path of least resistance.
If one of the standard close reasons doesn't fit the concerns you have about the post, it is better to spend a few seconds to explain why you're voting to close rather than simply clicking on the functional equivalent of "didn't you read the FAQ?"