Because why make a TF2 server if you can actually play TF2?
Stop saying this.
"why have a dodgeball server if you can just play dodgeball in real life?"
"why have a freebuild server if you can just build with legos in real life?"
"why have a challenge server if you can just set up an obstacle course in real life?"
This question can be asked with a lot of things that are likable in this game. Please stop being a friend about this.