@windwalker Hi Terri (and everyone), I just found the website https://bronchiectasisnewstoday.com/ It has lots of useful articles. There’s one that indicates exercise is helpful, and may explain why I and some other the others here seem to be ok without antibiotics: https://bronchiectasisnewstoday.com/bronchiectasis-treatment/exercise-training-for-bronchiectasis/
Another article from the same website suggests that it’s important for those without treatment or symptoms to be carefully monitored over time: https://bronchiectasisnewstoday.com/2017/10/10/untreated-patients-with-nodular-bronchiectatic-mac-lung-disease-fare-poorly-over-time-study-says/