I've always liked Wanda, but mostly watched her show without a lot of expectations. After it was over, there was a lot more than I thought I'd need to get off my chest about her arc, Vision, and their series WandaVision as an essay? rant? rave? It contains spoilers. Read at your own risk.
Wanda’s powers has grown in tandem with her emotions - how to understand what she's capable of, how others feared her, and what she has to do to protect her loved ones. Since she and her brother Pietro debuted in the Marvel Cinematic Universe in 2012, she’s had more than her fair share of repressed emotions to sort through. Her abilities were, after all, born out of a "hopeful" act of revenge against Tony Stark – whose bombs killed both of their parents and nearly left them for dead. It wasn’t long before they switched teams to The Avengers. With enough pain to wield once Pietro was caught in the crossfire, we got a taste of what she could do if she was affected deeply enough: decimating all of Ultron’s clones and ripping out another murder-bot's vibranium "heart" with her hands.
What’s made her formidable over the years is that her abilities let her do anything she sets her mind to. They’ve always been consumed or transformed her sense of self through heartache and growth, and defining who she is with and without Vision. She began to learn how to curb her skills until a fiery explosion forced her into internment with Vision at the compound in Captain America: Civil War. Not only did she and Vision connect over their link to the Mind Stone, her escape to stand up against The Accords began when Wanda was reminded she could free herself by crushing him into the surface, “I can’t control other people’s fears, only my own.” The question of her arc so far was never that she wasn’t powerful, but what she could do if she was totally in control of herself. The answer eventually came two-fold.