Yeah, SFF isn't always quite sure what's POB and what's not :-)
I think a "MCU-Wise, could Wanda have beaten Thanos" would be on-topic (characters are from the same universe; it's not exactly a gorilla vs shark situation), but I also think it might be redirected as dupe of the one I linked earlier.
Have you considered not limiting that to Scarlet Witch, and making it more of a question about Thanos' armor?
@ermanen if you have a doubt, you can always ask on chat or on Meta. It's a pity we don't have a sandbox, but there'll always be people trying to provide feedback to make it a good fit for the site :)
@ermanen maybe something about, say, does Thanos' armor have a special resistance, because it seemed to shield him very well against different powers, such as Stormbreaker and Wanda's magic.
Thanos himself is quite resistant but you seem to remember that it was the armor that dealt with Wanda's damage (I don't remember that tbh, but I trust you)
MCU-wise, it's not explained thoroughly in the movies, but there might be something in interviews of novelizations. Valorum is known to find unexpected quotes in the junior novelizations
I watched the movie Saturday, so my memory is hazy, but I suppose she mentioned something about how he took everything from her and he is like "I dont even know you"
Which, looking back, its not like Wanda knew that was an alternate timeline thanos
So she went full force against someone who, afaik, had nothing to do with her