Last year, Apple (NASDAQ: AAPL) made the then-unprecedented move of pricing the iPhone X at $1,000, inevitably sparking an ongoing debate about whether a smartphone should cost that much. CEO Tim Cook went on Good Morning America shortly after last year's unveiling in order to justify the price, arguing that most people buy phones on installment plans, spreading out the cost over time, and that smartphones have become "so essential" in people's daily lives that the devices provide more than enough value to justify the cost.Cook returned to the talk show this morning, in part to defend iPhone pricing again.FULL INTERVIEW: @RobinRoberts is with @tim_cook to talk about the brand new iPhone and Apple Watch--plus they love the new Memoji feature.