I agree. Nipping ideas in the bud with negativity is too easy and very counterproductive.

When my son was in his twenties, I let him dig his hole for 6-7 years. He started a company right after graduating, worked hard, and ended up earning negative money. In hindsight I feel like I could have asked more hard questions, and given more feedback instead of letting him dig his hole And hoping he would figure it out on his own.