That's exactly what they pointlessly tried to do. And they still don't understand that they've failed to do that at scale. The lightning network alone already routes more payments every minute than BCH can do all day. If they ever experienced any real popularity like BTC did back in 2017, they'd suffer the same fate, no matter how large their blocksize is. Meanwhile, having a large blocksize restricts everyday plebs from running a node. Hardware costs go sky high pretty quickly as you raise that particular number. That means very few nodes on BCH exist (comparitively) and if bitcoiners wanted to, we could redirect a few nodes of our own and 51% attack BCH quite easily. It has been done several times. So ultimately keeping payments on-chain is a security issue. The final boss for bitcoin is state attack, and that would be like handing them a leash around our necks.