Isn't that asking the wrong question? If I want an SSG, I want an engine that takes a relatively simplistic text markup format, like Markdown or Org, and creat

Isn't that asking the wrong question? If I want an SSG, I want an engine that takes a relatively simplistic text markup format, like Markdown or Org, and create a series of HTML documents from it. Why would the technology that does the gruntwork matter to me as an user? Also, with Jekyll's plugin structure, what is an example of a functionality that cannot be achieved in Jekyll, but can in another non-Ruby SSG?