More evidence. (Recruitment)

by Kermit , Raleigh, NC, Wednesday, November 15, 2017, 04:47 (2576 days ago) @ RaichuKFM

It's really simple to me. Inside implies being in a confined space. In implies being in an open space. That open space can still have boundaries but by using "in" you're putting emphasis on your location rather than your location relative to the boundaries of the location. Inside can also be a synonym for indoors.

You may not care about common usage but it greatly affects readability, which isn't about whether something makes sense and is about how easily words can be read and understood. You can say you're going for a walk inside the forest and be understood, but you may not be pegged as a native English speaker. :)