This is a great old topic! Discourse has acquired plenty of just in time nudging since 2013 and we are going to be adding more, also to educate people how to use markdown and find their way around Discourse. Today I just came across a really nice new one I hadn’t seen before! 
And writing this reply I am given a warning in the composer! Makes me think twice but I am going to just be so bold as to revive the topic. I like these nudges in the composer because they warn me before I submit. I’m intrigued by the new popup nudge above which takes a different, less intrusive approach by popping up after you submit and offering the “don’t show this message again”.
