README.md: posit why cpp is so effective over awk.

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@@ -47,7 +47,6 @@ preprocessor.
 One of them is a powerful `loop` facility that allows iteration (both
 parallel and nested) to be expressed by combining abstract clauses.
 
-
 Here is a program designed to demonstrate the `cppawk` `loop`
 macro, with its multiple clauses.  It solves the following problem: a
 projectile is fired vertically with an initial speed of 5. Every step of the
@@ -86,6 +85,21 @@ The output is
 This example is taken from the
 [`testcases-iter`](../tree/testcases-iter) file.
 
+By the way, how is it possible that we can implement an iteration language with
+expressive, not to mention **user-definable** classes using a preprocessor that
+is famous for lacking power?
+
+It turns out that a significant part of the problem with C preprocessing is the
+back-end languages being targeted. The C and C++ languages rob their
+preprocessing front-end of its full power.  C macros in the context of the
+"home language" have to contend with syntactic roadblocks, such as identifiers
+having to be declared before use.  Because Awk is a flexibly typed language in
+which variables don't have to be declared, it creates opportunities for
+significantly more freedom in how the C preprocessor can be applied, and the
+resulting macros can be much more clutter-free and ergonomic compared to if
+similar techniques were attempted on the "home turf". It's as if the C
+preprocessor were tailor-made for Awk.
+
 ## Roadmap
 
 `cppawk` is been carefully developed, and has a regression test suite.