It may be long, but other players can easily see when Scorch activates Firewall and will back up or move to the side, avoiding all the damage. Increasing the range will make it harder to back up to avoid the fire. You can still move to the side.
@BreezyStarfish17 It's simple. Too many COD and BF fanboys who refuse to play another FPS. I mentioned Titanfall 2 at my school one time and said it was better than COD and a few other kids who were close by said that TF was weird and I had problems. Yet they praise Infinite Warfare a lot, which is also a futuristic space FPS, just without 15 foot tall robots.