I’ve expressed critical opinions about the placement of Phantom Liberty into the main quest, because the first time exposed to it, it seemed like I was barreling towards a climax and then a detour was inserted.
However, when I played, but did not complete PL, it was after a longbreak from the game, I had jumped back in using a save just prior to the ”point of no return” in the original game. This time I think I’ll just accept it as the detour to save the President as it is, although it does offer another exit strategy that can save your character, but short changes the entire end of the original game, if I understand it correctly. That said, some research shows that the DLC can be completed, and with a certain choice, your character will continue on to the original game’s end game.