The vet I used to get advice from told me you could never go wrong worming your animals. Parasites can zap their health.I have a routine of worming/mite prevention, dosing every spring and every fall.
You will always find folks who agree or strongly disagree with preventive measures.
I have waited for symptoms as some would suggest and when I had an infestation of mites in a pen and the work it took to get rid of them,
Never again.
I will dose 2x a year to prevent that cluster....
Ivermectin and Safeguard, not at the same time.