The inconsistencies between Markdown implementations are annoying, but in my experience it's rarely an actual problem. Most seem to aim for Github's flavor with maybe one or two deviations, which seems to be the closest Markdown ever had to a standard. Whenever I try a note-taking or messaging app I just go in with that assumption and it usually just works.<p>Also let's not pretend other formats have necessarily more consistent or complete implementations. Sure, Github supports 9 different markup formats, but go try using .org files in anything but Emacs and you will always be disappointed. Some implementations can't even render checkboxes and pandoc is very inconsistent as well, not to mention a complete implementation would also need to fully support LaTeX.<p>> for any reasonably sized set of docs you’ll need things that aren’t in the basic language.<p>Any examples of features that aren't supported by Github Markdown?<p>> With other markup languages, you can extend the language to provide the features that you need.<p>Markdown can be mixed with HTML. Not ideal but very flexible.