Maybe a lot of people who went to see the movie might not have watched all the previous MCU instalments that had Wanda in them. Maybe they just enjoyed the first Strange movie and liked Stephen in Infinity War and Endgame (in which Wanda had a memorable two minutes of screen time) and wanted to see HIS story continued in the MoM. These folks last saw Wanda in the last Avengers movie and she was pretty heroic then. I think it's reasonable these people might be a little bit confused. That's my problem with this rapidly expanding MCU universe. MCU creators have to recap **** that happened maybe a DECADE ago. I think general audiences know about Vision getting crushed by Thanos, but the twin boys from WandaVision (?), maybe not. And the way they explain the more recent history of the MCU is through unfulfilling and often boring exposition dumps.