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Accelerate.framework is a shared library distributed with the OS. Like most other system libraries, it’s not available as a static library, and though you could theoretically ship a copy of it in an app bundle, you’re not supposed to. Instead the ABI is kept backwards-compatible.

There’s no publicly available compiler, proprietary or not, that produces binaries that use the instructions.

The public compiler wouldn’t generate them, or only generate them when compiling with a special flag.

Apple does not care that much about backward compatibility so having two incompatible binaries with the same architecture wouldn't shock me that much.

In theory that’s what bitcode protects against.

Today, that doesn’t save binaries not distributed through the store or ones you compiled yourself via other compiler chains.

It is possible to change that. One could even imagine it as part of the loading procedure.

https://lowlevelbits.org/bitcode-demystified/

Bitcode wouldn't really help too much here.