Thanks for the info, SiL! It's funny I was just listening to a Collider podcast yesterday where they were discussing the concerns fans get when they hear the word "reshoot."
I've adopted Christian Harloff's mentality when he said "It's broken record stuff for people who are brand new to hearing about this. Reshoots are part of a film shoot, it happens every single time. Now, sometimes they're more elaborate than other times, sometimes it's like 'oh my God they reshoot 90%!' That's an issue. 'They shot 5%,' well that's normal, you know. Taking notes from the audience - also very normal. They do that for test screenings...because they want your notes at the very end of it, as a fan, and if so many peoole are saying the same thing, then the studios are going to listen."
He never mentions first or second unit stuff though. The video is the Collider movie talk episode titled "Is Fantastic Beasts 2 Hiding Johnny Depp?" And his part of the discussion starts at 14:50.
As for the amount they're changing, I doubt you could redo the film so much in 3 weeks. You can change significant aspects, sure, like the ending or replacing certain moments in certain scenes.
