[Someone]

Also, BLAS is part of that interface (https://developer.apple.com/documentation/accelerate/blas)

Of course it is a black box in that you can’t (realistically) try and speed it up. You still run the risk of Apple’s priorities being different from yours.

[kergonath]

OTOH the interfaces are standard. Using Accelerate instead of the standard BLAS is just a compiler switch.