I actually think dog fooding is a net negative because it teaches people to ignore bugs and bad UX. Everyone at MS is encouraged to run the latest half finished version of some software. You assume it will be "fixed later", but never actually follow up. Or worse, you make excuses for bugs and bad design instead of fixing them.

Ultimately, this means no accountability because you are not developing products you yourself would use by choice. You use IE because you're supposed to, not because you prefer it over Chrome or Firefox.

Trying to please too many people = personas. Anyone who has worked at MS knows what personas are.