Some of the results of false doctrines in the church were; ministering questions rather than godly edifying, the paid attention and taught fables and genealogies, they did a lot of vain talking or fruitless jangling.
Doctrinal controversy hurts the church by causing division, confusion, contention, strife and evil suspicions.
It prevents growth because minds are clearly taken off the word of God, when that happens faith is stunted because it is not being fed.
The church mission is to teach sound doctrine; so therefore if the false teachers don’t have it in them they cannot teach it.