I have the same exact issue. The dialog boxes from the NPCs or quests are tiny on my 1080p TV. There is NO way to scale the dialog box, it is not the same as UI scaling. This is extremely frustrating that i have the hardware to play past 1080p and i cant because of small the dialogue boxes are. I have less than 5 feet from my TV and would need to squint. Now i have to play the game at 720p just so i can read the quest stuff.

This is not an issue on ANY other game i have played, only ffxiv.