What's the point with that quite lackluster story in Endwalker?

[KizuyaKatogami]

I assumed it was one of those anime moments where she used every ounce of her strength to accelerate and the moment she stopped to do something else she would lose her. My issue is why didn't they just delete the giant memory erasing analog clock to prevent said mcguffin from making a convenient excuse of why no one remembers anything and why we, the player, were not even given a hint of these events in the last 10 years, lol. I would have figured Emet would just blow the stupid thing up and tell the conclave.

Or she could have just used yknow, the echo, that huge plot relevant thing that we’re specifically told there can be used to show others memories.