ok, at lung.org I find :
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There are two forms of NTM lung disease. The less progressive form is sometimes called
nodular bronchiectasis. The NTM infection causes inflammation of the airways,
which over time causes them to become damaged and scarred.
As the disease progresses, the damaged airways lose their ability to clear mucus normally,
which invites recurring respiratory infections like bronchitis and pneumonia.
Nodular bronchiectatic NTM disease is found most often in older women who have
no smoking history.
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The other more progressive form of NTM lung disease is called cavitary disease.
The NTM infection in the lungs causes scarring, fibrosis and the formation of cavities
or pits in the lung tissue. This damage can lead to respiratory failure.
This form is most commonly found in people with a smoking history who also have
existing lung disease such as COPD or bronchiectasis.
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so, this terminology exists in USA , where NTM (non-tuberculous microbacteria)
is so common. It's not really bronchiectasis, which is a widening of the bronchii.
It's more like a classifiction of NTM, which often leads to bronchiectasis.

So, I'm wondering ... is the airway-clearance which is so much being talked
about here, importantant only for NTM or also for "normal" European
bronchiectasis ?