Lol...mmmmkay... I probably didnt see a single growroom on the west coast without gnats for almost a decade. We had some insane infestations, I cant imagine how bad theyd have to be to start killing plants. We just used yellow sticky traps, lots of yellow sticky traps.
But I'll take your word for it.
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depends what you consider killing. I once had to harvest two weeks early because the roots were so damaged the plant could not take up water and was dying. Million fkn gnats, but the larve is what kills the roots. To me thats killing the plant. So yeah, I don't want any.