If you doubt Tesla's engineering then you need to watch this
(www.youtube.com)
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What impresses me is the Tesla motor parts can turn at 18000 rpm and not explode. A Dremel tool spins its head at ultrasonic frequency max (20K) but it is small and light. For the Tesla motor to spin at that speed is strong parts engineering, because 1) it doesn't explode 2) wear at that speed is high normally. I have to wonder how they lube it, unless they use magnetic non-contact bearings.
Another impressive thing is the robotic manufacturing that Musk set up - it is very efficient. Others use robots but he has polished it all.
When Sandy Munro first took apart the model 3 engine, he noticed that the magnets consisted of smaller magnets glued together. It took him months to figure out the reason behind this: Tesla found a way to increase performance of cheaper magnets to match better, more expensive ones.
This one change saved Tesla a ton of money. Ford, on the other hand buys their motors from an electric engine company, thus eating away at their profits.
This sort of thinking is what has allowed tesla to achieve a 30% + profit margins per car (and going up every year).
Cheap materials....lower grade....gotcha.
The Model3 Tesla motors are rated for a million miles. Saving money means more profits.
But their batteries blow up after 50k.... It's like saying the thread is steal....and then making tissue paper clothing with it....the thread is lifetime guaranteed ;)