I would actually love to see an optional feature that would require commenting on completion. I have used a few tools that incorporated this, and it was a great feature, especially in a larger team. This can be partly a way to solve your @Bastien_Siebman “need a policeman” point - if there was an option to force comments upon task completion, we’d have a bit of Automation to do this for us. And among other problems you describe, help solve this one:
Fully agree that more commenting is better, good to see this thread going! With Asana’s good commenting capabilities, and fairly unique, excellent update capabilities, it’s about the best tool I’ve seen that gives a realistic chance for a team to get out of Internal Email (and chat tools as well for that matter, which I think tend to create noise given the usually lack context around what people are IM’ing about).