I play the old Final Fantasy games, maybe the developer could change the battle system to turn based menus.

That said, there is multiple targeting schemes in XIV and it sounds you haven't explored them much. The tab selection order can be changed to be distance based, and I'm fairly sure there is autotargeting closest thing when you use a skill. There's also assist for targeting the targetvif your target and you can make easily a macro that first select specific person in the group and then targets their target for you. (And keybinds for targeting specific members from your group if you don't want to combine these to macro) possibly other ways I don't recall now. My way is to click either the monster namebars or, preferred if possible, click the monsters in the aggro list as that's not all over the screen. Have never even tried tab targeting.