I think Julia makes clear how nice a good macro system can be. From simple things like @btime to the domain specific languages added by libraries like jump, mac

I think Julia makes clear how nice a good macro system can be. From simple things like @btime to the domain specific languages added by libraries like jump, macros just make a language way better. The only hard part is that once you have a good macro system, you will get lots of new users try to use it who take shouldn't.