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There's nothing "more direct" - the different APIs for different languages call into the same underlying library, and most of them are more accessible and easier to work with than C++.

Z3 is presumably written in C++ for performance, but without data I am very confident the vast majority of programs that use Z3 consume it via one of the other APIs.

The author might not know C++ and you don't need to use C++ to effectively use z3.

I personally like to avoid the “writing in C++” experience. :/

The authors of a powerful solver package thought differently.

The authors of a powerful solver package were solving a different problem than the users of a powerful solver package, and so different tools may be appropriate.

It might have more to do with the first release of Z3 being in 2012, with the first stable Rust release being in 2015. Rather than the authors of Z3 passing some kind of judgment on Rust…

Z3 uses a sophisticated and fast garbage collection scheme internally that doesn't mesh well with Rust idioms.

It's reference-counted at the boundaries. See https://github.com/Z3Prover/z3/blob/daf2506b6002149d531cb6c9...