>>96374840
Clairvoyance/divination is usually as bullshit as the nuke itself, even strictly limited to the present and the past.
It's literally a PLOT SKIP.
"Oh God-author! Please give me exactly the answer I need."
If you want any consistency / limitation, you make it incredibly hard to filter information.
If you divine "what are the enemy military plans?"
You obtain what random soldiers plan to eat tonight or battle plans for long past battles.
At least a nuke you can give it easy requirement
- can't caste nuke unless you are close enough
- need twenty mages casting for hours just to control it
- use the stored mana gathered in city of mages for month
etc