The target market might not care or know what the OS is, but they'll want to use software they're used to: Google Maps, Facebook, Facebook Messenger, Snapchat, Tinder, Skype, games, etc.
I'm just saying that whatever OS will be useless to a lot of people if it doesn't run what they want it to. One way to do that is to make it compatible with Android apps, which have already a version of virtually every major app.
Are you sure you know the target market you're speaking of? They're not coming from Android world, so they're probably used to exactly the kind of services these phones support.
