Within the MCU it has been said multiple times, point blank, that Thanos is the most powerful being in the universe. He was the only person to beat the Hulk, even though Hulk made a joke of the main villain in both prior Avengers films. He fought the Big 3 working in perfect sync and he won, straight up, completely fair fight.
But people on CV will have you believe that anybody who made Thanos use a stone can defeat him. It's like, Thanos and Captain Marvel are having an even fight, until Thanos finishes the fight using the stone. People somehow twist that into confirmation that he absolutely NEEDED the stone. I think he just used it because it was there and it helped. Who knows what his move would have been if the stone wasn't there.
Then against Wanda, Thanos isn't even interested in fighting her, she asks him for a fight and he literally responds to her point blank, "I don't even know who you are." Thanos doesn't care and is trying to run right through her towards his actual goal, the gauntlet. When he realizes her power, he calls his ship to help him. People somehow twist this into "Ohh she was about to kill Thanos any second... without his ship he was helpless... terrified of her power..." What??? We never saw Thanos take on Scarlet Witch in a legitimate fight. MAYBE he called in his ship to help, just because that was faster. HE DID NOT CARE ABOUT KILLING HER. HE JUST WANTED HER TO MOVE.
And then there's Thor, oh boy. Even though Thanos literally defeated Thor twice now. People are still saying, not only does Thanos lose, he somehow stands no chance versus Thor! All because Thor literally BLINDSIDED THANOS AT HIS MOST VULNERABLE MOMENT. Thanos was literally having an orgasm from the stones at that moment, and that is when Thor struck him. Thanos fired back a blast which Thor cut through, but he was still unprepared. Imagine being in the middle of an orgasm when somebody from literally nowhere just appears and punches you in the face. And your reflex action is to take a swing back or maybe just flail in defense. That reflex is not representative of your real best attack.
Also Hulk humiliated Thor in A1. Their fight in Ragnarok situated Thor as an obvious underdog, the whole idea was that Thor keeping up with Hulk at all was impressive for him. Thor even needs to go Super Saiyan during the battle because Hulk is beating him to death. And Hulk still takes zero damage from Super Saiyan Thor. He literally just gets up immediately and shakes his head. Hulk in the MCU has literally been hurt one time and it was by Thanos.