As far as I understood doctors, in march there was no guidelines for the disease. It was considered as a respiratory disease.

Later on, it was requalified as a vascular disease, scientists looked at cytokines / interleukin (I AM A ELECTRONIC ENGINEER, please correct me doctors).

Now, there is some systematic treatments earlier (https://jamanetwork.com/journals/jama/fullarticle/2770275), so yes, far fewer patients needs an invasive ventilator.

And that is great.