>>libert+P7
Back then, phone providers were competing to be the Nexus brand, so it was generally a loss-leader. The brand that released the Nexus phone would release their actual flagship about 3 months later.
>>libert+P7
7a is almost a flagship, so most people don't have to care their flagship series. Just buy a series. Nowadays "flagship" means that the best camera they can achieve.
>>libert+P7
They pack a lot more stuff into phones now too. Better screens, multiple cameras, etc. Today's flagships are also just physically larger than the older phones for the differences that makes.