If you're a business with a consumer facing app, you don't want to exclude 5% or 10% of your users. Most of the client projects I've worked on had a requirement to support iOS(-4) which is super painful from a development standpoint and usually the number of users on a device with iOS four versions old are in the range of 2%. But I get that it's tough for a financial institution or a streaming media company or a telco to exclude potentially 2% of users.
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