It took 9 years for Marvel Studios to solve Iron Man 2 2010.
2010: In the scene Tony Stark found a new element from Howard Stark’s document, there was Tony’s request for J.A.R.V.I.S
“Give me everything from projects PEGASUS, EXODUS, and GOLIATH”.
Notice that Tony stopped after saying “exodus” – the spoken version of that Oxford comma.
Project G.O.L.I.A.T.H is Hank Pym’s miniature zoom project. Resolved in Ant-Man 2015, Captain America 3 Civil War 2016, and Ant-Man and the Wasp 2018.
Project E.X.O.D.U.S is the Inhumans project. The story is: Skrull shares technology for many other races. Kree is inferior, shared by Skrull, and takes the attack against Skrull. In addition to Skrull, Kree also fought for thousands of years with the Nova Empire in Xandar (Guardians of the Galaxy 1 2014). Therefore, Kree travels across the universe to find & experiment with races to capture soldiers. To Earth, experimental Kree creatures called Inhumans, are more capable than Homo sapiens.
Originally a Marvel Studios intended for Inhumans to be a standalone film and decided to adapt to a TV Series. The TV Series is also too poor to clean up after a season.
E.X.O.D.U.S is Marvel Studios’ most failed project to date. Thanks to Ike Perlmutter.
In addition, Marvel Studios also made TV Series Agents of S.H.I.E.L.D. The most important detail is reviving Phil Coulson with blood / translation and technology of alien race. This is what happens in the TV Series, so it’s not included in the MCU cinema canon world.
Project P.E.G.A.S.U.S is the source of the capacity of Carol Danvers, and involves a Infinity Stone. Naturally solved in Captain Marvel 2019. Not spoiled.
Directors are very frustrated with Marvel Creative Committee when forced to include hint details about the following films. The most obvious rough detail is the Infinity Gauntlet in Thor 1 2011. Maybe just want to tease the fans and want Thanos to take the Gauntlet in the real Asgard. But then change his mind so that Hela can solve it in Thor 3 Ragnarok by saying “fake”. In the directors, Joss Whedon cursed the most and was forced to remove the hint. Luckily for Marvel, the exhausted Joss Whedon then left but the habit of bringing Space opera-style Serenity to MCU never got as decent as Russo Brothers did.