Heat can do some nasty things to an Aerospace fighter but I don't see them as any more or less effective than any other weapon besides the helpful overheat control roll which wouldn't matter in space combat but might in atmosphere
I really need to sit down with TW and get at least passingly familiar with Aerospace rules... But I thought control rolls were still a thing in space. Failing the roll means you end up on with some random facing, possibly taking SI damage for spinning too hard.
IN atmo, I know you take a control roll for receiving at least 1 point of damage. Or is taking at least 1 hit... Another control roll if the damage exceeds a threshold, and now potentially a heat induced roll. Not a good day to be a rocket jockey. :'(