Well, we can’t stay quite this simple. Audience has to be considered as well. With due respect, even the 10 commandments were like the picture books of God’s kindergarten; and Christ has us in college now. The sabbath is the key that God put in there to make it obvious, if it wasn’t. We have new wineskins now, not old ones. As another example of the expansion of grace... the 10 commandments said don’t curse father or mother (and also prescribed a literal death penalty for doing so). The gospel says do not curse ANYONE on this mortal coil and in fact attempt to bless them until they have departed it.
Now if this isn’t dynamite grace... I do not know what is.
Oh, the Sabbath hasn’t changed, and it’s made clear in the Bible that it is an eternal ordinance (Exodus 31:16)—same with the annual Sabbaths such as passover, days of unleavened bread, day of atonement et cetera. The breach of same is but one of the sins that got both Israel and Judah cast into captivity, and don’t think it won’t get the USA, Britain and the rest of professing Christendom punished for its breach. The scripture cannot be broken.
The wages of all sin is still the death penalty—Paul makes that clear in Romans 6:23, as well as the way to become free of that death penalty, which is the reason Jesus died. The ten commandments all stand; Jesus Himself was clear on that point, otherwise He would not have told the rich young man so (Mark 10:19, Luke 18:20), and He is the same throughout all time (Hebrews 13:8). As for cursing father and mother and dying for it, take note that Jesus upbraided the Pharisees for allowing people to get away with such cursing.