I don't think the only difference between this community and WoW's community is the existence of addons, and that giving us access to an addon API changes us into WoW's community. I don't buy that. It's a strawman, and not a very effective one.

As people have pointed out, an underperforming dps can and will be kicked right now without even the benefit of knowing that they were doing something wrong. Now I think that kicking someone for being 5% off their "expected" dps is a little stupid. There are a lot of reasons that can happen, especially in the mechanics-heavy fights that FFXIV favors, that have absolutely nothing to do with someone being bad at their job. At least if that dps can see their own numbers, they can know that something might be wrong with what they're doing and work to correct the problem. Right now, I think that most dps probably believe they do their job really well and aren't making any mistakes. I can tell you that in the majority of cases I've seen, this is not the case. But there's no convenient way for me to help someone do their job better if they think they're doing well already. I need data I can show them to back up something like that.

WoW players and FFXIV players are pretty fundamentally different. I say that having played both games at a high level. I don't believe that giving us an addon API turns us into some kind of MMO Lord of the Flies rendition.