The extra ending and Shadow Wars sounds kinda cool, actually... sort of like a MGS Peace Walker or MGS V sort of deal. Chapters 1-4 and Chapters 1 respectively being the main story, but then a sort of bonus epilogue ending with a bonus ending.
That said, balancing it in a way that heavily promotes RMT to buy loot boxes sounds lame but... I suppose that's subjective, too. What one person feels as grindy and promoting RMT, another gamer may feel is not all that bad of a grind. Some people said MGS V did this and I never once felt that way; in contrast, GTAO does it heavily (at the start) even if you're a pretty hardcore grinder. So we'll see how it goes I guess.
If it ends up being a case like DX Mankind Divided where it's sort of pointless, it's still regrettable though because why even include it then. Guessing it'll be more like a case of MGS V where it's pointless for the story but promoted for the FOB endgame.