I'm not sure of all the valid use cases for macros, but I think they are useful when you need to do something simple. For example, a debug flag to run some code

I'm not sure of all the valid use cases for macros, but I think they are useful when you need to do something simple. For example, a debug flag to run some code like verbose logging but you don't want to include that in the release binary. C# has preprocessor directives but I wish that java had something similar. I guess this is different than complex micros though.