I am one of those that worm regularly, due to my climate and worm load. Most of those that worm regularly do so due to a history of repeat worm infections due to the high load in our environment. If you have never had an issue, then I would also suggest getting a fecal done (mixed sample of several fresh droppings from your birds), that is the best way to know. What I usually tell people who are just starting out is, get a fecal, if it's clear then repeat that in 6 months (unless you see any symptoms before that). If it's clear again then just do a fecal once a year to make sure (even cats and dogs are recommended to have fecals yearly). Good to be familiar with common symptoms in the event something changes and then you can repeat a fecal or treat if necessary. Some environments are heavily loaded with parasites, some are negligable. If you don't have a vet that will do a fecal for you on chicken droppings then you can use a mail in option like this one:
https://www.amazon.com/dp/B000J5SOZ...colid=27RHKHAM35GO&psc=1&ref_=lv_ov_lig_dp_it