How much of all of that clean room conditions is truly necessary? I ask not to be combative or to just support Tesla, but I know the US has a habit of only accepting the absolute best medical equipment, whereas hospitals make do with good but not great equipment and are able to save lives and save money. There is a risk, but there is also the issue of peopling dying because of no ventilator. So what's better? Having no ventilator, or having an one that gets the job done but isn't made with "medical grade" equipment.
If Tesla were to just build existing ventilator designs, like Medtronic's Open Ventilator, Tesla wouldn't be getting any criticism from anyone. That would be a truly useful thing to do in this situation. For example, nobody is criticizing Tesla's partnership with Medtronic to build the solenoids that are supply-constraining Medtronic's Western production of ventilators.
But Tesla wasting time and money on a new ventilator that won't go into production during this crisis is not praise-worthy, especially considering that what they have still needs weeks of work to make it usable in a clinical setting even if they wanted to start production immediately. It's just like the submarine they built for the Thai cave crisis. Lots of overthinking and self-praise going into something that ultimately couldn't be used by the people it was intended for.