But even the secrets that the actors do know have been quite stressful to keep, as Scarlett Johansson recently lamented.
Therefore, I imagine Marvel and the Russos have kept the circle of trust as small as they could, which I expect means that Tom Holland and Mark Ruffalo have not yet had the privilege of seeing Avengers: Endgame.
It’s one thing to keep a secret between friends, it’s another entirely for a massive film with a budget in the hundreds of millions and people constantly asking and trying to trick you into revealing its mysteries.