"Metal Gear Solid V: The Phantom Pain" has ended with unresolved plot points and unfinished storylines, which is reportedly not really appealing to fans. While fans hoped that the previously revealed "Mission 51" will be added to the game through an update or DLC, it did not happen. Additionally, a post by "Metal Gear Solid" Twitter account revealed that Konami has no plans of continuing the cut mission and that the game is already finished.
Fans believed that the company will take their time to finish "Mission 51" and the ending of the game when they announced the "Metal Gear Solid V: The Definitive Experience." However, it did not appear to be the case as a tweet from "Metal Gear Solid" explained that "Mission 51" has been cancelled.
The tweet reads that the development of "Mission 51" was cancelled before it was even finished but it is definitely not the ending of the game. It is actually a prequel game to "Metal Gear" released in 1987. The tweet also clarified that the ending of "Metal Gear Solid V: The Phantom Pain" is not and has never been missing.
However, it is still unclarified why "Mission 51" was cancelled after the company previously released behind-the-scenes footage. Some fans guessed that it is because "Metal Gear Solid V" hit a massive production budget and its development took a lengthy cycle. Because of this, Konami may have been short of enough budget to keep going as the delays in development is costly.
"Metal Gear Solid V: The Phantom Pain" final mission, according to fans, included a newly discovered concept art with cutscenes that seemed to be half-finished which are actually not part of the game. However, it has been noted that these scenes were depicted in the footage of "Metal Gear Solid V" collector's edition. Unfortunately, the ending that the fans were given is final as reportedly Konami has no plans of revisiting the game again.
Watch "Metal Gear Solid V: The Phantom Pain" gameplay walkthrough here.