Thanks Quinn @DTS Engineer for a fast response here :)
I'm unrelated to the original author, yet had a very similar question. We were looking into compiling our app for arm64e (for the benefit of added user security); we stumbled upon this article (Apple dev documentation link), and thus believed that it's something publicly available.
However, we then stumbled upon the iOS 15 minsdk requirement (for the current XCode) which isn't really well documented (except for the compiler/linker warning in xcode 15.3+ when targeting older minsdk).
So if you could share, are there any plans to eventually allow arm64e for 3P devs? Am I correct that there are some unresolved issues, i.e. ABI isn't guaranteed to be stable yet and may break in a future iOS update? Furthermore, it may require AppStore submission pipeline to support arm64/arm64e slices -- potentially, targeting different SDK -- and thus there's some work which needs to be done on the AppStore side?
If that would be helpful, I can ask our Security team to reach out to you with more details w.r.t the motivation to someone on your side.