I agree that would disqualify it as a universal language candidate. At the same time though, how often do you wish you'd thought out your next sentence in its entirety when speaking to your girlfriend/boss/mother/etc ?
What this tells me isn't that we need better tools (whether they be software or languages or anything else), it's that sometimes people say stupid things, and we need to be more understanding. A hundred years ago, it may have been reasonable to expect that a long-distance friend would never say anything rude to you, because they'd have time to edit their words. It isn't reasonable to expect that anymore. People haven't changed, but their ability to edit themselves has. Instead of trying to recreate that ability to edit ourselves, we need to evolve our interactions with each other so that these thoughts that we had time to edit before don't play such a big role in our communication.