How do you know they didn't make a course correction mid-filming?
I mean... they might have but I thought you were suggesting that they course corrected with the Affleck version of it after Joker, since that’s who you mentioned and was just pointing out the timeline of it all showed they course corrected previous to the Joker with Affleck leaving, Pattinson coming on all five full months before Joker came out.
Or you mean they course corrected mid-Joker filming? I guess that’s a possibility too, but remember that movie was looked at as a bit of a gamble too with it being only a 40 million dollar and DC’s first R rating. It pretty much took everyone by surprise that it ended up being a Billion Dollar hit and Oscar hopeful. So I think that would have taken a ginormous set of brass balls to course correct based on mid-filming of a risky bet like Joker. Could be I guess.
Edit: that seems very unlikely since Affleck dropped out almost a year before Joker even opened and actually dropped out the same month (Sept 2018) that Joker started production. I just don’t think WB totally revamped their entire DC plan, especially with their biggest superhero, based on dailies after a couple weeks of Joker.