Temu's JIT (Just-in-time compilation) mode is very useful in some scenarios. It allows the program to dynamically compile code into native machine code at runtime, significantly improving performance.

This mode is particularly useful for real-time applications that require high performance, such as games, graphics processing, and big data processing.

However, JIT mode may not be suitable for all situations, such as the maintainability and scalability of code with high runtime requirements, and potential compiler optimizations. In short, Temu's JIT mode is indeed very suitable in some scenarios, but may not be applicable in other scenarios.