It could also be that any changes to history by the Temporal Cold War were ultimately negligible, and the timeline eventually sorted itself out to still lead into the future we're familiar with.
That's my take on it.
I think at the conclusion of the TCW, Trek's history was largely
preserved. The Xindi attack on Earth may not have been mentioned onscreen in TOS, TNG, DS9, & VOY, but it might have been so offscreen.