Tesla is the electric version of the Exploder LOL. Quality control is pretty poor for such an expensive car.
Thankfully the PTU is just gears, no clutches. Shouldnt be hard to redesign to an HD version, frankly. Ford is likely building to a price point, and causing the effort to fail monstrously. Just like there came into existence the HD gear set for the gen 1/2 manual trans, with people willing to invest in a group buy, I dont see why a better PTU could not be easily created. And with a vent extension too. For the people, by the people, of the people.
Anyhoo, simply having a drain plug and a routine maintenance interval with quality **** is important, cooled or not. This is one way to overcome the flaws in the design. All I am going to say, follow bpd's example. Don't wait for parts to fail. Take responsibility from day 1. Show that you understand you bought a performance car. Don't just demand, get your hands dirty.