You have hit one area that has always confused me and where the Church may wish to revisit.
- If one has committed a mortal sin, but prays an Act of Contrition, can they just wait until Easter to both go to Confession and receive Holy Communion?
Technically, Yes, and meet the minimum requirements [Catechism Reference] but, in practice, someone should not wait a year to go to Confession if they have committed a mortal sin.
The first precept tells us we are obliged to attend Mass on Sundays and on Holy Days of Obligation but attend does not mean attend and receive Holy Communion, though most people do.
The problem I see is that there is no uniformity between the minimums one has to:
- the sacrament of Confession and
- the sacrament of the Eucharist and
- attend Mass.
There is a (1 to 1 to many) minimum relationship, instead of a (many to many to many) minimum relationship.
I would humbly recommend the Church consider changing the frequency relationship or criteria between the first, second, and third precepts for the good of the Body of Christ.
Someone new to the Church, or returning to the Church, may be more prone to receiving the Eucharist when they are not in a state of grace if they don't understand the precepts correctly or have been poorly catechized.
Separate from the minimum requirements, the United States Bishop's Conference has recommended all Catholic families go to Confession at least on a monthly basis. I personally recommend that people with more important roles in the Church receive the sacrament of Confession more often.
Pope St. John Paul II went to Confession weekly, even if occasionally it was just devotional.
Just my opinion.