in todays episode of Whiskey Tango Foxtrot...

Uhhh...
I'm guessing you live where there are no building inspection requirements?
THis worries me a bit. I am considering a move to another state but THAT state is a bit more relaxed in many ways. There is good and bad in that but as a Carpenter, I know that there are hundreds of ways that unskilled construction workers can hide structural flaws. Drywall and siding can and do hide a LOT of ugly work.
OSB plywood (Oriented Strand Board) is used for structural conditions and sound deflection. We use it on Duplex party walls, apartment party walls and exterior walls where additional strength is needed. IF the OSB is on an interior, it could be for sound or strength. On the exterior, it is exclusively for structural reasons, in my experience.