MCAS was the result of computer modelling... and had to be increase from 0.6 to 2.5, because the computer modelling missed issue at low speeds...
Cars are crash tested to be certified, and there extensive computer nodellings also there, even Formula 1 cars are crash tested and are all composite materials.
IMHO this shows that Boeing has gone all the way to save money jeopardizing safety... and what is a bigger concern is that the FAA is just their rubber stamping agency