Lots of links with XC. The scientist being smacked around by Klaus in the cutscenes is Lady Meyneth, aka Galea, soul of the Mechonis. Klaus' other half is Zanza. XC was ending during that dialogue with the architect. The world the majority of people ended up in was XC. Unbeknownst to both Meyneth and Zanza, their world still exists, the Land of Morytha. When Klaus created his universe he sacrificed the current one, or so he believed, to create the universe in XC wherein his other side and Galea were both reincarnated. The half of Klaus trapped in between would be the one to create Alrest and give mankind a chance in an attempt to redeem himself, eventually becoming known as the Architect. There are still a few ways to tie it into XCX since it's said that there are people completely lost to either realm and XCX could simply be those people. Makes sense with how XCX's story went?
Fun that we never knew Meyneth's true name until the end of this game. It's being speculated that ties with XCX lie in the Nopon homeworld Mira and the space station being a future version of Mira wherein the conduit kept mankind from going the way of the dinosaur. I didn't finish X to know sadly, but I think that they were simply lost between dimensions makes sense beyond how do you tie in the Nopon being in all 3 games?
I thought it fitting that Meyneth, who originally wanted Klaus to stop his universe creation experiment as seen in XC2's cutscenes, died with her final wishes for a world without gods in XC. It all ties together rather beautifully. Klaus' guilt is very real and very gutting once you know exactly what he caused. His atonement and recreation of the world during the final cutscenes is fitting and somewhat bittersweet since that type of thing is exactly why the world is the way it currently is. Never fuck with the universe.
What I want is ties to Saga. Don't give me Kos-Mos and leave me hanging. But if there are any I haven't noticed them beyond the design of the conduit.