Do things that incumbents can't or won't do because it's economically or technically infeasible.

The most customer-centric organizations can answer any question by deciding what's best for the customer, without ever having to ask.

I believe there's plenty of market for each; we're talking about an ecosystem that is going to support billions of devices, so a competitive landscape is good for consumers, developers, and the platforms alike. Apple brings a smooth elegance to its devices and platform, with the best marketplace experience to boot. Google brings a higher volume of devices as well as a more diverse ecosystem to interact with. The real story here is that Microsoft is nowhere to be seen, ending a two-decade monopoly and creating biggest opportunity for software startups probably ever.

The only barrier to entry you can create is to consistently build a great product.

Focus too much on the near-term and you won't get tomorrow's customers, focus too much on the long-term and you won't get today's.

Do things that incumbents can't or won't do because it's economically or technically infeasible.

If every customer is using your product "correctly", you'll never learn anything interesting about what to do next.