AC Shadows Ending - I feel ripped off, man (SPOILERS)

I gotta get this out there because I feel kinda ripped off ngl

Turns out there are a total of 4 templars - 2 foreign and 2 converted Japanese, that were pulling the strings of the Shinbaku (I spelled that wrong)

I just killed the final Templar named Nuno or whatever - Yasuke declares war on the Templar order, meanwhile, Naoe goes with Hanzo to search for her missing mother

Then the end credits roll...

Like, what?!

- Where is Naoe's mother?

- Where is the final box?

- Where is the Grand Master of the Japanese rite? Did they really only send two Templars to a new country and call it a day?

- Where are the rest of the Templars/what are they doing?! Nuno hinted they would be coming after the League

- Who is the guide? Scratch that, who even are we (I'm talking about the modern day)

Do they really plan on drip-feeding us the rest of the story through DLC or new games (for the modern day)?

If so, that's pretty scummy

Ps. You don't even get to kill the Shinbaku leader, he negotiates his way out of dying

What the hell!?