...is a sin, then we are all guilty of sinning, since we are never completely worthy to receive Jesus! But that isn't the question, since Jesus's sacrifice makes us worthy!
The issue is whether Our Lord gave the Catholic church the authority to “bind and loose" – ie. The ability for remitting sins and setting laws for it's adherents, etc. The Sacrament of Confession is for the remittance of their sins, especially Mortal ones! For the sacrament to be "valid", the penitent perform the “penance”, as well as, making a firm purpose of amendment; that includes the avoidance of sin! It is the second part that raises the question as to whether an individual priest can offer “reconciliation” for a civilly divorced and remarried Catholics. What the Holy Father has written in Amoris laetitia leads some to believe that it should always be made on a “case-by-case” basis,ie. – it is a pastoral question.... Others feel that the traditional teaching on marriage in the Catholic church can't be changed by a individual priest's judgment! But it is in the individual priest's “judgment” to offer Christ's forgiveness for the penitent's sins in the first place – so I don't see were the conflict is with the Pope's writings.
The problem is that the "meaning" of the Sacrament of Marriage has been diluted, and it has been reduced to mere sentimentality in many cases -- brought on by the lack of proper teaching and catechism for at least 3 generations of church faithful, imo! Additionally, as you have properly noted: Catholic's use of the Sacrament of Reconciliation has been curtailed significantly!
But, now the confusion this has caused in the Church is palpable. Prayer and fasting, along with the action of the Holy Spirit will fix this! Meanwhile, it is left to each individual to consider their behavior, and to understand what they are doing when they receive “unworthily”. ie. In a state of mortal sin – but the proper development of the conscience required to determine one's state of one's soul has been hampered! I wonder who(Satan) is behind this “normalizing” of sinful behavior??!