Yeah, essentially we are looking at episodes 1: interplanetary war and man's scattering to the stars (also the creation period for Deus a biological and mechanical being, 2: Eldridge's fall to Earth and time of Abel, 5: Resurrection of Deus and Fei's awakening.

While some things in Saga and Blade X have changed since perfect works, there's still a definite connection. Intergalactic war, Earth's "destruction", the Galactic Federation, "Neo Jerusalem" and "New Los Angeles" (or New City of Angels). Certain tech from Xenoblade X could surely be seen as prototypes for tech that appear in both Gears and Saga.

It can still be related to saga and gears, but so far, we got nothing confirming it. Atm we can't slot it in the same way you can slot in Saga and gears.
I like to think the first blade is the creation of the xeno universe and it's all a time line, just because of that final blade form calling back to Xenogears. But yeah, no clear connection.

Only saga and gears really, as the characters are very similar, besides names and that.

Maybe, but no direct time line can place Blade or 2 to Gears and Saga, however X can be placed exactly in episode 1 of perfect works, Saga series takes place around episode 2 of perfect works, and episode 5 is Xenogears.  There's direct historical events that take place that these games hit.

Yes, it's possible, but just speculation at this point. Fingers crossed for an X expansion or sequal that can expand it (and make me buy a switch).

It would be great. If Deus is in X2, then it would be undeniably officially part of the Xenogears time line.  My fingers are crossed it is, but even without the historical similarities are a little too convenient I'd say.

Really all that Xenoblade Chronicles X needs to be consistent with Xenogears are two name changes and a date change.
New Jerusalem = New Los Angeles
M24 = Mira
500 years to prepare the exodus from earth = 50 years.

There might be more, I can’t think of any though. There could be a Zohar in Xenoblade Chronicles X that hasn’t entered the plot yet.

The story fits very nicely in the slot of the foundation of New Jerusalem, since New LA at the end of Xenoblade Chronicles X seems very well situated to being the founding city and future capital of a Galactic Empire (assuming they can reopen passage. The imminent threat is gone for a time. But there are other possibilities to consider: Retelling the Xenogears story without the Galactic Empire with the White Whale being Eldridge.

1. Mira is cut off.
2. Most human bodies would be synthetic creations of the Kadamony device
3. While we don’t have an Abel shown, it doesn’t necessarily mean he is absent.

The big missing factor would be the Deus weapon. Takahashi would need to write something new into that slot to be the purpose for a higher dimensional being somehow living on Mira. It might be that the Zohar exists for some non-human project on Mira, maybe a Samar thing - I don’t want to speculate too much, because there’s literally a ton of possibilities. So, a sequel would:

A. Involve the establishment of a Galactic Federation in the near future (a few years to a few hundred years later) or:
B. Take place on Mira thousands of years down the road ina Xenogears-like retelling.

Something that hints toward ‘Option A’ is Xenoblade Chronicles 2 - the multiple Titans are like multiple planets orbiting a central area... it was likely a lot safer to go that direction than planets to get a feel for multiple smaller worlds and how he can keep them toned down in size without it feeling too limited.

If Takahashi is still reading Asimov, particularly the Foundation sequels (or the Robot/Elijah Trilogy) then there’s some very interesting stories to tell. Although Xenosaga was already heavily influenced by Asimov - particularly Foundation.

I have more to add, on Xenoblade Chronicles 2 now that I am in chapter 8.

The game appears to be another retelling of Xenogears, although focusing on other plot elements than those adopted into the first Xenoblade Chronicles - you have a Grahf character in Malos; who like Grahf summoned ancient technology to destroy much of the world 500 years earlier, even the timelines match up in this case. Jin is another Krelian archetype - much closer this time - a character seeking annihilation due to the pain suffered in the past, and the burden of the knowledge of the truth of the world; also, the death of his love; with Krelian it was Sophia, with Jin it was Lora. Then, of course, there is Zeboim civilization at the bottom of the Cloud sea.