"Second, this model unbundles the existing financial system into layers run by independent companies...."

“Second, this model unbundles the existing financial system into layers run by independent companies. To see the value of this, contrast with the US mobile carriers, who used to own the entire stack. They owned the handsets, the operating systems, the applications running on the phone, and the service. This meant that most of the stack never had anything pushing it to get very good, and there were even incentives to hold it back in order to preserve legacy revenue-generating facilities like SMS. By enabling competition at individual layers of the financial system, each one should improve.” -

Another point on the importance of layering to innovation:

Bitcoin: the Stripe perspective