Seinfeldi still dont get why you're not "supposed to" surf rockets in ammomod. it's more fun
Well I'll try to explain my take then.
I think the specialty of ammomod is that without surfing it becomes very centered around movement. You try to move unpredictably such that your opponent can only hit weak rockets, while you try to read into their movement and juggle them with directs. The fact that this is very fundamental and super hard to master makes it great practice.
If you surf (most of the) rockets, this defeats the purpose of what ammomod can help you train, and it reduces to a generic fight of any other arena really. To me that is not fun and actually boring for 15, if I want to train with me and my opponent surfing all over the place, I'll go to arena 4, 5, or 6.
Kind of besides the point, I also think there's an argument to be made that not surfing is generally a more optimal playstyle if done correctly.