Out of the five points I wrote only 1 and 3 can be tested via a standard USB C tester device if it existed. 2 and most especially 5 is fiercely expensive to tes

Out of the five points I wrote only 1 and 3 can be tested via a standard USB C tester device if it existed. 2 and most especially 5 is fiercely expensive to test and 4 is well, software bugs (firmware is just software, after all). You know how that goes.