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This is exactly where the question of this thread "Which hero do you like?" becomes relevant.
In the early stages, a Nature warrior's summon provides 20% more Wolves and Tigers, and at the same time, level 2 War Magic offers great opportunities. Meanwhile, a Fire mage gaining 20% to their magic loses potential 20 points of defense, which risks losing the hero.
Or in the late stages of the game—in the final battle, for example—using mages with GM (5lvl) War Magic is more useful than using a similar Chaos caster with GM Scouting. After all, you can't just wipe out a mage in one blow, whereas a Chaos caster will most likely be able to use their +20% magic only once. Everything is learned through practice ;).
On the other hand, skilled players on rich maps use advanced classes—exactly those you mentioned—during the first few weeks, but they bring mages with War Magic into the finale regardless.
But in most cases... everyone has their own preference; any tactic can be a winning one :)