Alright, so in Infinity War, when Thanos obtains the reality stone, it is evident that he is able to shape reality in whichever way he wants. This is shown when Gamora is able to kill his duplicate, and with ease, he is able to bend reality to bring himself back and make Knowhere burn.
My question, then, is why did he fight the avengers during the Wakanda fight scene instead of, say, turn them all to stone like he did to Drax? Also, if the reality stone is able to shape reality, wouldn't that give him any powers he wants, rendering he other stone useless?