I’m just thinking, if Starfleet knows Prime Spock is from the future, Starfleet and Section 31 will want to know about possible future threats to the Federation. Prime Spock would be a treasure trove with his knowledge of the Doomsday Machine, V’ger, the whale probe, and in the long term, the Borg and Dominion. Then there’s minor threats like Khan and his augments who are still on the sleeper ship that’s still out there, or even the Klingon moon of Praxis explosion that could still happen several decades after Trek XI since I doubt the Klingons are going to stop overmining their moon.