I don’t know about anything at the scale of Apple.
But my simplified imagination of any product is: focus on core customer/demo, once you’ve captured a significant portion, expand.
But I also wonder if at apples level, if the customer is “everyone” which I always think of as folly for most business.
Example (which may partially disprove this): I know some people in developing countries, who consider an iPad an essential device. (They have a cheap android phone) and for them, it’s much more valuable than a computer.
(Though, the people I am thinking of are “high” earners in their country, making 20-40k a year. Even if an iPad is almost double the cost.)
Part of the reason this number's so high is that if a phone feature is really important to you, you're liable to get a standalone VoIP line and a headset to go with whatever handset you have rather than using a smartphone.
But I would also hold that phones generally suck, but that’s opinion.
Technically compared to e.g. internet-native voice communication, or you just think that remote voice communication is bad?