I suppose it's always a correct decision to vertically integrate and invest heavily in tooling, from a pure monopolist standpoint. Doing so reduces stakeholders

I suppose it's always a correct decision to vertically integrate and invest heavily in tooling, from a pure monopolist standpoint. Doing so reduces stakeholders and improve control, which should grant more power to management than constantly having to succumb to engineering, market or baseline reality. But e.g. very few laptop manufacturers are even capable of designing and fabricating own display panels(not sure Apple does?), let alone ones that provide any advantages, so there's that.