Make no mistake, I think $1.4 billion is a tremendously satisfying (and personally unrelatable) number. But let's be realistic about one of the largest companies in the world. They are focused on profit. (yes, Disney is a fun, positive, entertaining brand, but they have bills to pay and shareholders to satisfy.) AoU cost more and made less money than Avengers which may or may not have been initially acceptable to TPTB. And so there may be a grain of truth in what was reported, even if it is sour apples flavored reportage. (Or just conjecture, for that matter.)
All things considered, if..IF...Disney/Marvel was disappointed in AoU's BO performance, it is ultimately...how you say?..rich people problems. Boo hoo, they earned a few hundred million dollars less than they thought they would. No gold party favors for the Christmas Party this year. LOL.