The tendency to dump all kinds of unrelated stuff in the kernel is a very bad trend. It increases the attacks surface of the kernel in unpredictable ways and will lead to security issues, especially with something as complex as an interpreter.
Interpreter is very small part of overall kernel codebase, and it is the same interpreter for all kinds of applications written in wa, need to be analyzed only once, but performance benefits of running code in kernel space are huge. Moreover, wa can even make kernel safer but rewriting certain not very performance critical parts of the kernel in wa.
