While I would like to have a damage meter so I can improve myself, personal experience has shown me that majority will abuse the damage meter to demean and insult other players so they themselves can feel better. If everyone used the damage meter with the intend to help their fellow players, then there would not be any excuse for SE to add them to the game. But SE has seen from other mmorpg's that the damage meter will do more harm then good. People who are friends or raiders who play toghter often will use the tool to improve and help their fellow players, but a stranger in the DF, probably wont do the same.

I have seen people mention how the damage meter is not abused in WoW right now and while I can not confirm this, I do know that when the addon was released in the first 2-3 years, I witnessed the community become a toxic cesspool, this is when WoW community also started getting a bad reputation. People were excluding others alot of content, newcomers were abused and excluded from content and the worst was when people started to use the damage meter in level 15-70 dungeons and kicking newcomers for not meeting the standards that they have set.

With FFXIV, I do not know if our community will be as bad as the one in WoW, but right now we already have people being very toxic towards others. At the end of the day, if someone is a bad player and does not care, they will not change, even if there is a damage meter.