Indeed.
The Leviathan DLC revealed the Catalyst to be nothing more than a failed A.I., misinterpreting its mandate thanks to the flawed programming of its creators. It is no more clairvoyant than Miss Cleo.
You can disregard nearly everything it says about the inevitability of conflict between organic and synthetic or the apocalyptic doom assumed to follow . That is the programming of the Leviathans speaking, and it possesses no crystal ball capable of gazing into the future. The Catalyst is Mass Effect's Harold Camping.
Shoot the tube.
It just says the chaos will come back.
Chaos being organics making/developing AI and being in conflict with them.
Shooting the tube, for Shepard himself, isn't going 'that'll never happen'. Its him going 'we'll deal with it regardless, without you'.
Bringing peace with Quarians and Geth only allows immediate unification for a war.. against other machines. It is a good sign though. One that even a Destroyer can use, in their hope for a better future.
That's what it is about. Hope. Or the lack of it. You don't need it, to do your job.
Catalyst is no Harold Camping. He/It acts on predictive models, obviously. Models based on history. The Prothians, for example (if we are to believe Javik's tales at all) fought the Metacon War against machines. Okay, they won. Awesome.
But how many Prothians died in the process? Thousands? Millions? Billions? More?
Organics die, and never return. Chaos. Conflicts like this could have been averted. In fact, this is the kind of thing that Paragon Shepards often live for. To safeguard others. To ensure that they have a chance, that isn't cut short by great conflict beyond their own control.
Catalyst never says "You're all gonna die when the robots come back!". No. It just says 'chaos' and 'conflict'. All of that is gonna happen at some point. Without Reapers to police it, it'll happen even worse than otherwise, for sure. With Reapers to police it, you take the chance that the Reapers won't go out of control. Either is a risk. With Destroy, you are gambling lives for the sake of greater freedom of those lives. With Control, you are gaming the galaxy and allowing the Reapers to fix their mistakes, but someone else better not take the controller from you!