What makes you believe in-house SW is more reliable? Anecdotal or not, I know people who worked for both a X's (German car maker, not VW) supplier and X themsel

What makes you believe in-house SW is more reliable? Anecdotal or not, I know people who worked for both a X's (German car maker, not VW) supplier and X themselves in SW engineering and he told me the supplier was on a totally another level above the in-house development process. Suppliers also have tradition in car sub-systems. They also provide complete sub-systems (hardware and software). Much easier to implement the SW when you also build the full HW (injectors, pump, rail, sensors, ECU, etc.). You should see some of the development labs. Tens/hundreds of millions of EURO invested in equipment over time. The only guys I know, who are still keeping a lot in-house, are the Japanese car makers (though they work with some locals in Japan, they can't be that independent). That market is opening a lot more to EU suppliers in next few years for sure. In general car makers just lack the technological know-how to do a lot of stuff in-house. If they give up suppliers tomorrow, gonna take many years just to catch-up.