I have begun exploring Asana for task management on our small team (4 - 7 people). So far the tasks and conversations have been simple and effective, a testament to Asana's design and intended use.
The issue I have run into is simple (at least in scope). There is NO option to edit comments or conversations after they have been posted. The need for an edit option is simple, you make a spelling or grammatical error and want to quickly fix the comment. I have come across a comment by Justin Rosenstein on Quora offering the sub-optimal solution of deleting and reposting a comment; somehow in relation to maintaining the integrity of hearting posts (which didn't really make sense to me how an edit function would impact this).
I'll put this simply, I use conversations and comments to exchange information, which is predicated on my ability to clearly communicate. This often requires fixing or clarifying comments which I (and likely many others) would prefer to be able to do in the fewest steps possible (click edit, edit comment, done).