Really dumb question about duping...

For a good while now, i see people using the various dupe mechanisms... all good, you do you.

But it makes me wonder... why not just spawn a stack in your inventory through the extra game options? Like, why do say, the factory cart thing, when you could just press a button in the menu a couple times?

Or do people not realise that's an in-game* option?

*added for clarity.