With the release of XCode 6 some time ago, Apple have intentionally removed ARMv7s architecture from the default build architectures. This is the main reason why we do not build native assembly for this architecture. The ARMv7s instruction set is slightly different from ARMv7 and the last device to support ARMv7s but not ARM64 is iPhone5C from 2013.
Therefore we advise our clients to use ARMv7 + ARM64 architectures and we've had no reports for issues with such configuration. This way iPhone 5 and iPhone 5C will fallback to ARMv7 whereas all newer devices will take advantage of ARM64.
Lance | Tech Support Engineer, Sr.
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