Someone brought up a point that waiting till March next year would mean that lots of people buy the new models with high profit margins (especially across the holiday period) and then in March after its died down they release an update. I'm not sure how likely it is but It makes sense to me.
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Didn’t Apple just build a new plant in India last year specifically to build the SE?
Granted, they could continue to sell the SE outside the US, and other major markets as they did with the 4s and 5c long after that phone was discontinued in the US.
But let’s think about why Apple would discontinue a phone they built a factory specifically to make only a year ago:
1) they are retooling the plant for an updated SE, and discontinued it since they couldn’t continue to supply that model from the same factory as they gear up for the SE 2.
2) the parts used for the SE became unavailable, or more expensive due to low demand, or will in the near future, so Apple decided to redesign.
3) discontinuing during this launch gives Apple the ability to see how the market responds to higher margin, larger handsets to gauge how big a market exists for the SE 2 which is already designed and will soon go into production if a March launch is really going to happen.
4) a new design is necessary if Apple wants a low budget, “international” phone to last another 3-5 years, which means the US would need to necessarily be a part of that launch, and indeed subsidize the development costs at an initial higher cost, before it can become an international commodity.
5) Apple over-designed the SE to provide high level of service for the price to ensure it could carry the customer through this anticipated retooling gap when updates would no longer be offered.
And those are just the first five things that came to mind ...