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I won't speak for everyone, but personally, when I play against demons and develop light magic, I always take fire resistance. This not only negates the effect of the Fire Lord but also provides -50% damage from fire attacks, so it offers good protection against hellfire. Demons always have hellfire, regardless of their magic, so fire resistance is simply essential when playing against a demon (if you are developing light magic, of course).
And in general, it's not a given that the demon will choose Fire Lord. Other Chaos skills can easily replace it.
I don't really consider hellfire to be some mega-powerful skill that a demon must necessarily enhance, and opponents must necessarily develop protection against it. In Lords of Chaos, they weakened its base damage but increased the spell multiplier, and in practice, it turns out that the damage is weaker than it used to be. In my opinion, Cursed Sign with Devil's Strike is much better now. Withering Flame requires level 4, while Devil's Strike only requires level 2+, and attack is still much more useful for a demon than chaos magic, in my opinion.
In general, the Chaos school has many other skills, and quite useful ones. For example, Mana Drain is also not bad for the undead soldiers of Inferno. There are also quite useful skills, so it's generally not a good idea to forget about Chaos, especially on small maps.
Дайте мне всего шесть строк, написанных рукой самого честного человека, и я найду, за что его можно повесить.
Весьма хороший попутчик... До первого перекрестка.
Весьма хороший попутчик... До первого перекрестка.