The reason I wrote the "documentation comments" to POD converter was POD, in Perl5, requires repeating a lot of information that is already present in the code. In Perl6, Pod has an enhanced syntax that allows to referring to information in the surrounding code. Though I didn't know that when I wrote my converter.
The reason I chose to convert from Doxygen style comments was that I already use Doxygen for producing the "low level" design documentation in C/C++, which is what is used at many companies producing electronic control modules. Advantages of doing this include most of the function prototypes and data structures are in place by the time the design is approved, and all of the (text of the) documentation is in the comments of the code, so is much easier to keep the docs and code in sync as changes get made. And, of course, no repeating information that's already in the code (unless you count the descriptions of what the code is supposed to do as repeating the code).