I wouldn’t mind hearing the Jewish understanding on Enoch and Elijah. I believe it would greatly help us better understand these two great prophets.
As for the Catholic understanding of their assumption and the effects of Christ’s mission:
The Holy Sacrifice of Jesus is eternal, so its effects expand time, reaching from the beginning to the end of the world and of history. The effects of the death of Jesus are eternal because Jesus is the God-Man, and as God, He is outside of time - He is yesterday, today, and tomorrow - so His work is not bound by time but is for all time: yesterday, today, and tomorrow (i.e., past, present, and future).
Hence, the gifts which our first parents received from God are the effects of Jesus’ death. The same goes for every grace which all men receive, and this also includes the assumption of Enoch and Elijah.
Now, one could argue: If this is the case, than why did our first parents fall from grace, instead of having enough grace to not fall? And why did Israel have to offer sacrifices if Jeuss’ death as the Lamb of God is eternal? Well, first off, this assumes one big mistake: God is in error. But God is never in error, for He is God. This isn’t about rationalizing the irrational, this is about the truth. Our first parents had the grace they needed to not sin, yet these graces - indeed, all graces - do not hinder free-will. Grace purifies the soul, making it more free to choose to do good, because this is what free-will is: the freedom to do good. So our first parents had great freedom to do good, but they chose to disgard God’s grace and sin. The same can be said of the angels. As for the animal sacrifices of Israel, they did nothing on their own, it was Christ’s Sacrifice that profited Israel; rather, the Lord ordered the animal sacrifices to signify and point to the death of Christ, the true Victim. Furthermore, the sacrifices point back to the time of the garden of Eden, when man ate animals to survive, and they point forward to the Eucharist which Jesus would institute, and they point even further to the consummation of creation, when all things will be subject to the Father, for the animals which Israel sacrificed had been used to give God glory, and man, as the steward of creation, must use everything to God’s glory, for God made everything for man and man for Himself.