Other car companies do outsource, but it's tricky. Toyota, for example, invests a ton in building long-term relationships with suppliers. [1] But Toyota is the exception here. The more typical oursourcing relationship is one of low bids and dangerous incentives. As Toyota shows, it's not impossible to get it right. But I think it's reasonable to be concerned.

[1] https://www.stateofflux.co.uk/ideas-insights/case-studies/to...