Scarlet Witching hasn't liked movie Wanda from the word go. They refused to post anything about the movies. And a lot of it for good reason. But they are gonna be suspicious of the MCU's handling off the bat. I think it's also easy to give into despair as a Scarlet Witch fan.
Kevin Feige has said that he's also inspired by Bronze age comics as well. And some of that has been reflected from character depictions. Infinity Gauntlet/War itself is pre-2000s. So I think he takes from different eras. For Wanda and Strange, there wouldn't be any other comics reference to Wanda and Strange going at it other than AD. And I feel like WandaVision was already as close as they are gonna get with replicating that era. People forget that there have been other times that Wanda and Strange have worked together. Specifically about the Darkhold too.