Rust is definitely not a simple language, I agree there.
I am quite likely a bit naïve here, but I'm having trouble understanding why you hate that this is possible. Now, the macro system definitely can generate near infinitely-complex code, but I'm not getting how implementing a sandboxed lisp using macros is a particularly potent example of the language being less manageable than at its genesis.
On another note, the fact that the type system is turing-complete, like with C++ templates or the Haskell type system (variously dependent on which GHC languages extensions you're using...), makes me want to see a lisp implemented that way!
I am quite likely a bit naïve here, but I'm having trouble understanding why you hate that this is possible. Now, the macro system definitely can generate near infinitely-complex code, but I'm not getting how implementing a sandboxed lisp using macros is a particularly potent example of the language being less manageable than at its genesis.
On another note, the fact that the type system is turing-complete, like with C++ templates or the Haskell type system (variously dependent on which GHC languages extensions you're using...), makes me want to see a lisp implemented that way!