'Bad' is not the right word, there is a time were misting/humidifiers are useful. It cools the ambients, which is fine, if that is the purpose.
But, if the cage is losing so much moisture it needs water added daily or weekly, it is a whole lot easier and less problematic to fix that issue (water loss).
People go a little wacky with ambient humidity, perhaps because it can be measured. I put more thought and effort into the substrate and let the ambients be what they are.
Think of humidity more like temps, you don't heat the entire cage to 150F and then cool it all off to 70F (at least I hope people don't do that). Offer varying levels of moisture in the cage at all times, let the monitor pick the humidity level it wants.
--Robert