there is no harm done in planting by moon phase

Depends how close you have to match the moon phase. If it's just "don't plant at full moon", that could mean take one day off - probably no harm, in fact good- or take a whole week off, which if the weather is unreliable could be disastrous.

The lead smelters in Derbyshire smelted lead ore at the equinoxes for hundreds of years. This was related to the method of smelting- an utterly primitive and wasteful (but traditional) technology which required great bonfires on hilltops burning for days, and poisoning the downwind landscape. Whole areas (bellands) are still waste as a result.

Less damage is done by traditional agriculture, though they do wear out the land now and again. Perhaps the biggest damage is in discrediting alternatives to industrial agriculture.