The reality stone by itself didnt work like that. I dont recall what the Aether did in Thor 2 but in order to change reality Thanos needed all the stones. The reality stone did surface level stuff and wasnt permanent. Like when he Changed what Knowwhere and Titan looked like. Or when he turned Mantis and Drax I mnto cubes and a slinky. The effects wear off. It's very surface level it's not changing reality to bring people back to life.