Why? Because one goes to Confession even when one is in the state of grace and therefore doesn’t need to be reconciled with God.
Confession needs to be encouraged as often as possible and don’t wait until mortal sin and the severing of the life of grace.
If you are not in the State of Grace then yes you do need to be reconciled.
Don’t just leave Confession until you need it when you are not in the State of Grace.
Why not go weekly and be proactive with the grace of the Sacrament to fortify against sin.
Correct terminology Sacrament of Penance or Confession.
Reconciliation is the wrong word and Sacrament of Reconciliation is wrong.