Nothing wrong with running evap. It won't hurt performance at all and it marginally affects mpg. I drive a daily so I still care for emissions. I agree, for high horsepower applications, you're polluting enough anyways so who cares at that point.
And the point wasn't directly about the evap system, but that you could potentially create a hazard, pollute, and set codes if you don't have them tuned out.
Again, if you read, that's just my opinion. I'm sure plenty of people don't care about a tiny hazard like that, but all it takes is one spark, personally I'd rather not risk it.