I dismissed suggestions of that before this, but I think that has to be seriously considered. I can’t think of many other reasons this would underperform. I just thought its strengths would overcome it - recognizable star, strong reviews, strong P&A, barren marketplace
It’s also been almost five years since Justice League and at least personally, it feels much longer with the pandemic and everything since. Homecoming came out barely three years after TASM2 which had performed much worse than the Snyder Batman movies did at the BO. And its star was a complete unknown (even if Iron Man was in it)