Il Mheg 1/2 of two mirrored zones?

[Cybylt]

Then if nothing up to this point can be changed, why add the convolution and risky storytelling of time travel at all when you have a perfectly healthy timeline that can just stay background information? It also flies against five years of Warrior of Take a Third Option.

I think this has hit the crux of why I'd rather time travel stay in Alexander land.

If we can change things, consequence is meaningless.
If we can't change things, we've jumped ship of five years of building up WoL as the absolute unknown variable that makes any outcome possible.
If we can't change things up to this point but can make things the "same" to set something up down the road, that's just a convoluted and contrived way of reaching the same conclusions you would have had without time travel... so why have time travel?