I think that large companies optimize for a fundamentally different outcome than smaller companies, like startups. Large companies became large by applying a successful business model, something that startups are still lacking. If you have a working business model and stable cashflow, any change is potentially dangerous and can take down the company. So in contrast to whatever the marketing material says, rigidity and inability to change is actually an asset for large companies. This means the more inflexibility is added to the organization (e.g. by imposing a Book of Procedures that can never be abolished, employing people with no real power to change anything, or self-selecting a staff which is, put blatantly, incompetent to change), the longer the organization keeps existing. Until the market changes fundamentally, that is.