Is it because this is not in Pharo that this is better? May be this is a new trend?

It�s because Sven ask me to point him the PEG grammar I saw for markdown.

Ok

And I think that Pier could benefit from a md parser

may be
to do what? so that people can edit file with pier using mardown? in addition to the pier syntax?
May be but I do not have time for that. Now if somebody needs that the pier code is MIT.

Now if you have the time, you can write a pier exporter and everybody will be happy
but I will not code in lua nor haskell nor ruby nor PHP.

Personally I prefer to focus on the real parts: writing good books

Stef