Not overheating on purpose was way more fun at 4.0 when it was more difficult to not screw up. Now i find that way too easy and a bit boring (they might did that so we can get plenty of time to see what happen around instead of being focused too much on the heat system), so you might want to oh anyway to spice things up.

That being said if you dont go into savage and such, not overheating is not gonna be a problem, you can do a decent dps without that.