If Metal Gear Solid 4 proved anything, which I'm not sure it did, it proved that "ending" Metal Gear Solid was not as simple as telling a final story that wraps up the series' plot by blabbing on about each of its characters, and so Metal Gear Solid V decided upon the opposite.
Metal Gear Solid V is a game that refuses to explain itself. Its narrative lies in quietly humming each of the series' personal and political themes. Its grand tricks are found within how rote it feels when you're told, arbitrarily, to "eliminate" a target, how your eyes glaze over as you select every face and name that speaks Kikongo as it slips from feeling like murder to feeling like mechanics. Its soul rests in the moment you see a "Big Boss is watching you" poster and, in contemplating that you disagree with this use of your face, realize that you have become more symbol than man.
This game is "unfinished" because it never can be finished, there is no conclusion to a story about an unescapable status quo that doesn't contradict either the "unescapable" or "status quo" parts of that phrase.
MGS 1, 2, and 4 tell a story of the next generation, how maybe, just maybe, the next generation can do just a little bit better than us, and how maybe that can rub off onto the future generations. Death Stranding tells a story that implores us not to give us hope in our quest to help fix things right here and right now. But this is a story that is desperate and angry about us right here and right now, its suffering heightening Kojima's other works about healing.
Also, the way it plays totally rules. Genuinely one of the best feeling third person video games I've ever played. I enjoy the immediate sensation of hitting the w key on my keyboard in this game more than entire other games that I like, and it offers the most interesting guard AI and alert system in the series.