Having access to a parser can help players get better at learning skill rotations and can help them know what gear sets are more effective than other gear sets.

They way FFXIV is now, most people who want statistics use ACT and get to see the whole party's numbers. Within the first few weeks of playing, I saw too many disparaging comments in the novice network about other players numbers and I ended up leaving that chatroom because I don't want to hear that negative chatter.

It doesn't seem like it would make much of a difference if an in-game parser was added or not to stop the hurtful comments made about other player's statistics. There is a parser and it shows you your whole party's statics already. I would rather see SE do like Turbine did and prevent the game client from seeing other player's numbers. Then if SE added an in-game parser PS4 players could see their statistics also and no one would have any ammunition to give other people grief over their numbers.