Granted. But does that mean:
A) You're always right because you're a genius who knows all the answers,
B) because anything you say will become the right answer?
If (A) then you know the truth of your future. Including that you'll get married, and eventually your wife will cheat on you and say nothing and it'll tear you apart (and the kid isn't yours), and the way you'll die (you have a heart attack, sorry no avoiding that), etc.
If (B) then you break the universe and everyone dies.
I wish I was a more powerful Wizard than Lord Voldemort, and I could beat him in a 1v1 duel without having to use some bullshit loophole.