You can configure whatever you want and it won't stop the spam

It is not. Configuration is HOW you know what consensus is. Example: If I give you the Option to choose between the colors red, white, and blue. Then 20% choose white 10% choose blue 70% choose red The overwhelming consensus is that red is the prominent color. But that doesn't mean you'll NEVER see blue or white. But if I say: "Here is your option, the color red." You will never see blue or white no matter what people prefer. Removing configuration is removing choice.

Not the point.

Configuration is not consensus. I can config whatever I want and consensus valid txs will still be in my bloclchain data and UTXO set