The thing is, Noah's Ark wasn't just a boat - it was a lifeboat. And when you're trying to save every species on the planet from a massive flood, you need to be pretty careful about what you're bringing on board. It's like packing a go-bag for the apocalypse - you need to prioritize the essentials, and leave the non-essentials behind.
Imagine if Noah had allowed everyone to bring their favorite snacks, or their cozy pillows, or their entire wardrobe. The ark would have been overloaded, and who knows, maybe it wouldn't have even made it through the flood! It's like trying to cram too many suitcases into a taxi - it just won't work. So, the bag policy was crucial to the success of the whole mission.