I'd expect Lisp macros to be easier to debug, since they are written in Lisp themselves (and not in a template language) and the usual interactive debugging too

I'd expect Lisp macros to be easier to debug, since they are written in Lisp themselves (and not in a template language) and the usual interactive debugging tools apply. There are lots of Lisp DSLs using macros which have been maintained by different people over several decades.