He uses those powers as the need arises or as it serves the plot, same as every other character, but he does it often enough to warrant their use in forum fights with PIS off. TP might requie concentration sure, but he can do it from behind forcefields and I don't see them pounding through his shields in able time. He has defeated very powerfull telepaths and PG and SG TP defenses aren't on WW's level. He'll KO them first.
I never said he would one-shot them, but he'll just keep blasting away. An while WW's Aegis shield is impresive, that'll just prolongue the fight into an atriction contest that he'll win.
SG might be less competent, but I don't think it'll be a blunder from her that'll give thanos the edge. Even at their best I don't think they can take him down if he is at his best. It takes more than 3 midheralds to put down an upper trans level like him.