WoW was the first MMO to have the ready check feature. The reason why nobody spams it or trolls with it is because it shows who started the ready check. So if one guy was going to troll with it over and over he could be kicked.

I haven't seen anyone troll with it on FFXIV but if its going to happen all they have to do is put in a line "X Player" has started a ready check. That way if someone is going to spam everyone else knows who it is and they can be kicked for harassment.