BE is widening of the bronchii , so anti-obstructive
Although
- when they are full of mucus -
-or why are they widened - is it a reaction to obstruction ?

there are clear guidelines for COPD-definition,
changed recently

GOLD 2024 defined COPD as a heterogeneous lung condition characterized
by chronic respiratory symptoms (dyspnea or shortness of breath, cough,
sputum production or exacerbations) due to abnormalities of the airways
(bronchitis, bronchiolitis) or alveoli (emphysema) that cause persistent,
often progressive, airflow obstruction.[9]
https://goldcopd.org/2024-gold-report/