Thank you.
While I agree that the Church says instruction should be given by a priest to engaged couples, "instruction" is not the same as "classes".  That is my only point.

I agree.  There's a balance to be had.  I had a relative by marriage who wanted very much to be a Catholic.  He had the faith and knew a lot about it, since he was married to a Catholic.  He had been raised by a Protestant preacher, and his wife put a green scapular under his mattress, and he just woke up one day and decided he would become a Catholic.  In any case, they went to the NO and were told he'd have to take a YEAR of classes before being accepted into the Church.  Since his wife wasn't amenable to Traditional Catholicism, I told them to speak with an Eastern Rite priest.  That priest interviewed him a couple times and then conditionally baptized him and received him into the Church a couple weeks later.

When my wife and I were getting married, we had one hour-long meeting with the priest.  This priest knew me (and my wife) and just said, "You know all this as well as I do, so this instruction isn't really necessary, but I'm required to go over this with you."  So it was just one meeting.

So it depends on a case by case basis.  If there was a person ardently desiring to become Catholic and it could be determined from a single interview that he knew the faith and accepted the teaching authority of the Church, there's absolutely no reason to delay a long time or to go through a year of classes.  On the other hand, sometimes you have these situations where a prospective spouse is seeking to be Catholic just because their prospective spouse is Catholic, and you just don't know if they truly have the faith and are sincerely inclined to be Catholic or, rather, are doing it for the social reasons.  In that case, you probably want to draw it out a bit to discern if they really have the faith.  I've known Trad Catholic priests to readily accept these "spousal" conversions (IMO too hastily) only for the "converted" to "revert" soon after marriage after things get a bit rocky.  They went on to use Traditional Catholicism against their spouse in subsequent divorce proceedings, referring to it as a cult that was harming the children.

The reason for instructions/classes/teaching on marriage is to outline the requirements of the sacrament, the duties involved, and the purposes why God created it.

It's been inadequate for those purposes.  That's why I've long held that the prospective couple should be required to sign a statement/declaration to the effect that they understand and accept all of the Church requirements for marriage.