That's a daft reason. What would be "unsmooth" about requiring a connection for coop when you decide to play coop?it was probably a deliberate design decision to make online co-op as easy and smooth a transition as possible. Not the answer you were hoping for, but probably makes the game experience better overall. Assuming you have the internet.
It's more likely that this isn't really a single player first game but a GaaS with some shop/mtx element which requires it. A bit like how people were advertising SoT being played solo but it's really a GaaS.
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