They got to see what turned out to be the biggest blockbuster of all time before the rest of the world – though that obviously makes a hell of a lot of sense.
At present there are nearly a dozen Marvel Cinematic Universe shows currently in development as Disney+ Originals, but the fact that WandaVision and The Falcon And The Winter Soldier were among the earliest in the works provided Jac Schaeffer and Malcolm Spellman with an awesome opportunity.
In order to do the work they were hired to do, it was pretty important for them to know exactly what was going on with Scarlet Witch, Vision, Falcon and The Winter Soldier (among others) in the wake of Avengers: Endgame.