[flohofwoe]

IMHO #include for making declarations visible to other compilation units is the one big feature where ditching the preprocessors makes sense, at least in C++ where headers contain both declarations and implementation code (it's not as critical for C). Simply being able to include a file anywhere in the source is still useful (simply as a generic text-processing feature) so #include shouldn't be removed if sharing declarations if solved differently (for instance through a module system).

Same with #define, no harm in adding actual constants to the language since it's a simple, straightforward and expected feature. But that's no reason getting rid of #define because that's also useful as a catch-all text replacement which doesn't work on the language-level (and that's useful in many situations).