Doctor doubts Coronavirus is causing damage to the lungs?
The medical community is a strange group. Like most "professionals" once they get something accepted as "fact" it is almost impossible to change their mind. Does not matter if the accepted solution is right or wrong, just that it is accepted.
There are two vectors that the virus attacks the lungs that have been known for weeks now.
1. Pneumonia where fluid fills the lungs.
2. Where the lung tissues become infected and dissintigrate due to the virus infecting lung cells.
People can have issue breathing if their muscles are straved of oxygen, and the brain starts shutting down the body when it starts to lack oxygen and energy at a sufficient level.
With all that said resulting brain damage can also effect body function.
However even after someone recovers from the pneumonia stage the lung tissue remains damaged with diminished oxygen absorption capability for a long time -long time.
This has been known for weeks.
So there are multiple vectors on this.. and there is no one solution fixes all... setting on ventilators. If people have lung control capacity though they shouldn't be put on ventilation but that doesn't remove the context of needing ICU care or oxygen therapy. As stated you still need a vehicle to deliver oxygen even if it isn't a ventilator.
The ability to absorb oxygen due to lung tissue damage remains the main ongoing issue, but this varies as the disease progresses, lung disintegration early is pneumonia but as this progresses, it leaves damaged tissue as the prolonged issue, that is there is a acute pneumonia followed by chronic lung disease.