Depends on what you define as open world. FF7 Rebirth is some large zones with pretty linear spots in between them (whether that's a town, or having to boat across the continent).
D2 is large zones separated by a ship loading scene.
If you're going to whine about one game not being open world because it's multiple worlds, you should be crying about the others too.
This just in, video games don't always do realistic depictions of history. Unless Nobunaga really was a cat.
Developers aren't looking to make a game that won't get greenest and recognized that something action related is going to get some traction, whereas a game where you play as a figurehead not doing anything wouldn't leave the drawing room.
"Long Running"? What a clickbait title- 17 months isn't even 10% of the game's age. Maybe if they weren't doing colored artifacts for a set (pretty sure all since Shards of Alara have had them), no 2+ color lands, etc the "long running" would have been warranted.