Turn based tactics games have the concept of the "action economy". Each side of the battle has some number of units who each get some number of actions per turn. If all else is equal, the side that collectively gets more actions per round is favored to win.
Of course, all else is not always equal. Alice and Bob the level 1 peasants aren't going to beat the Elder Dragon just because they get two attacks per round and the dragon only gets one.
A deficit in the action economy can be counteracted by an opposite advantage in some other factor. If the heroes have twice as many actions per round as the monsters, the monsters can keep up by doing twice as much damage, or starting with twice as much HP, or having twice as much chance to hit.
As long as people are only spending their actions on dealing damage, that is.
Where the action economy really rears its ugly head is when units can spend an action to entirely nullify an action from the other side. This can transform a small advantage in actions per round into a crushing advantage, or even lock the other side out of acting altogether.
If Alice spends every turn throwing a net that takes the Elder Dragon its one action per round to get out of, while Bob pokes away every turn with his pointy stick, the Elder Dragon is going to have a bad day.
(Which is why the game designer will usually modify the Elder Dragon to have Immunity to Nets)
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