[toomuchtodo]

Tesla (and SpaceX) has experience with life critical code (running vehicle powertrains independent of the rest of the vehicle subsystems; please save Autopilot critiques for another thread).

A fully validated ventilator is ideal, but if your other option is death, a ventilator that is "less than fully validated" might be preferable.

EDIT: You're right to acknowledge there might be bugs, it's important to quantify risk. You decision based on the risk(s) raised.