[imron]

> It could also be argued that comment quality could be improved by allowing people to delete comments at any time

Ok, but what's the argument? What specific incentive for good comments or disincentive for bad comments is there with such a system? If anything, there's no disincentive for ill considered comments because you can always come back at any time to clean up your bad behaviour, but in the moment of commenting, there's nothing holding you back. Compare that with:

> As it stands, an ill considered comment is set in stone after 2 hours.

Which is a clear disincentive for making ill considered comments. Having such a system in place certainly makes me consider my comments more carefully before posting.