I would not conflate the open source philosophy with makers.
On one hand you have a development method used by thousands of software engineers and programmers, used to develop, most of the software stack that runs the modern world (if all open source software stopped working today, we would be thrown back to the late 1800 basically).
On the other you have a bunch of donning Kruger know it all “makers”. Who, strong of their experience building led lighting and crappy second year undergraduate control systems, think that in a matter of weeks you can go from not knowing anything about a subject to mass production (which in itself for a maker is almost risible); only taking care of posting each brain fart on some blog/YouTube/website for publicity
The JPL team, on the other hand, for which I have massive respect, did the design, I’m shure with the help of life support specialists at NASA and their institutional knowledge in the field, got it certified, and then posted online for publicity. That is a much different attitude.
As for certification, the regulators know full well that doing a full blown year+ certification in those conditions of need was unthinkable, they started doing emergency certifications, which were both much faster and much easier to get.
To end on a hopeful note, not all makers are so hopelessly full of themselves, a bunch of people’s (the majority I hope) rightfully identified an area where they could indeed help, and started 3D printing face shield components. PPEs are just as important and lifesaving as ventilators (actually they might even be more important) and are a much easier target, since a malfunction will not result in life altering injuries or death