Catholic Doctrine all makes sense - Confession once a year

It just makes sense. Everything fits together.

For instance, if you have not committed mortal sin you don't need to go to the sacrament of confession but once a year.  (CCC #1457) Why is that?

Well, that's because venial sin is forgiven in the Confiteor. The Confiteor is the prayer that we pray together at the beginning of Mass. The one that starts out, "I confess to Almighty God, to blessed Mary ever Virgin…."  It is a public confession in the presence of a priest.

If you happen to be late to Mass and miss the Confiteor, your venial sins are forgiven when you take communion.

And so, it isn't necessary for a faithful Catholic to go to the sacrament of confession more than once a year unless he has a mortal sin on his soul.

However, the sacrament of confession is recommended as frequently as possible because it is an outpouring of God's grace, a gift, a participation in God's life. Why would we want to minimize that? We should want that as often as we can get.

Yes sir, Catholic doctrine all makes sense.