about all those laws that were supposed to be binding for all time?"
is going to depend on the particular laws in question.
laws, with which you're probably most familiar, are still to be in force
today. This is because they are characteristic of God himself. If they are
characteristic of God, and God's character is eternally unchanging, then
these laws should likewise be eternally unchanging.
laws largely prefigured God's redemptive work of the cross (like sacrifice).
With the coming of Christ ("I did not come to abolish the Law but to
fulfill it"), those laws were completed.
laws, similar to ceremonial ones, served perhaps two purposes. They
served (primarily I think) to set Israel and Israelites apart from the rest
of the world. These were, and to an extent still are, material examples
of the spiritual sanctification God's people are to exhibit in the midst
of an unbelieving world.
laws additionally (intentionally I believe) served to protect early people
from certain nutritional dangers (bottom-feeding creatures, scavenger birds,
etc.) which civilization would only later come to discover and eventually
laws were for the operation of the nation-state of Israel. If indeed
these were to be binding for all time, "all time" likely ended
along with the original nation-state in AD 70.
Did God give us laws
we can't keep?
Principles of God's