They are serving the whole market. You may be thinking, "I need a decent sized phone that can fit into my pocket, and I'll just use my laptop/desktop for the he

They are serving the whole market. You may be thinking, "I need a decent sized phone that can fit into my pocket, and I'll just use my laptop/desktop for the heavier lifting." The vast majority of the market is thinking: "I need a computer and I also need a phone, but I can only afford one." Obviously, this second segment wants the screen to be large, because they don't have an even larger screen sitting at home.