I treat as needed. I don't do any type of chemical worming on a regular basis. Good husbandry goes a long way. Keeping their areas clean. Fresh water. I copper bolus on a regular basis. I have minerals and kelp out free choice.
Except for cocci prevention, most of us dont worm kids till they need it.
You see, dosing when they dont need it or under dosage is what contributes to ineffective wormers.
Then we have management. Keep hay off ground. Pasture with short grass is where they're going to pick up the buggars.