At some point, I wonder if there will be advantageous for AI to just drop down directly into machine code, without any intermediate expression in higher-level l

At some point, I wonder if there will be advantageous for AI to just drop down directly into machine code, without any intermediate expression in higher-level languages. Greater efficiency? Obviously, source allows human tuning, auditing, and so on. But taken at the limit, those aspects may eventually no longer be necessary. Just a riff here, as the thought just occurred.