This reminds me of the old Soviet joke about the kid in a classroom, asking if Marx was the greatest scientist in history. After being assured by the teacher that that was the case, he asked “Well, why didn’t he try this crap on rats first?”
On top of the point that they still have to be mass produced, we now have a surplus, and we’re finding out that in many cases we don’t need them (and may have been killing people with them).
[Update a few minutes later]
Related Twitter thread. Pronation seems to be more effective and safer than ventilators.