Mods do add another dimension to the game and they do help increase the longevity of the game, I do not debate that, but from a scenario design perspective they should never be used to correct a problem or a deficiency in the game. If a scenario comes with a mod the average user will not install it, even if it is easy install and harmless to the game. If the mod is critical to the scenario then the average user will not play the scenario or they will play the scenario without the mod and a large aspect of the scenario will be lost, or the scenario will look foolish.