1) I can't remember anyone reliable who thought the iPhone 6s was a flop, as opposed to the fact that the iPhone 6 had an immediate surge due to pent up demand.
2) The fact that Apple went so many years without a big screen phone, with people demanding it, and then when Apple.did release it they underestimated demand, proves that Apple can be mistaken in their assessment of the market. You're correct that just because people here seem to indicate they want a small phone doesn't mean a market for it exists. But I do remember the exact same comments being made about a larger screen size phone as well before the iPhone 6. IOW, just because Apple doesn't offer a small phone, doesn't mean the market for that doesn't exist either
2) The fact that Apple went so many years without a big screen phone, with people demanding it, and then when Apple.did release it they underestimated demand, proves that Apple can be mistaken in their assessment of the market. You're correct that just because people here seem to indicate they want a small phone doesn't mean a market for it exists. But I do remember the exact same comments being made about a larger screen size phone as well before the iPhone 6. IOW, just because Apple doesn't offer a small phone, doesn't mean the market for that doesn't exist either