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These [sacrifices] had always been temporary until the coming of the promised Messiah

While, I understand the common understanding is that the offerings in Leviticus were "temporary" it is quite clear that Scripture says they are not. For instance, during what many would consider the Messianic age, offerings will be made.

Then everyone who survives of all the nations that have come against Jerusalem shall go up year after year to worship the King, the LORD of hosts, and to keep the Feast of Booths. Zech 14:16

And the LORD spoke to Moses, saying, “Speak to the people of Israel, saying, On the fifteenth day of this seventh month and for seven days is the Feast of Booths to the LORD. On the first day shall be a holy convocation; you shall not do any ordinary work. For seven days you shall present food offerings to the LORD. On the eighth day you shall hold a holy convocation and present a food offering to the LORD. It is a solemn assembly; you shall not do any ordinary work." Leviticus 23:33

While many Christian commentators explain this away as "Feast of Booths without sacrifices... just because" - can you explain how Paul did not understand the "temporariness" of the offerings?

Then Paul took the men, and the next day he purified himself along with them and went into the Temple, giving notice when the days of purification would be fulfilled and the offering presented for each one of them. Acts 21:26ff

And here is what Paul was required to offer for each of the men completing their vow - and for himself:

And this is the law for the Nazirite, when the time of his separation has been completed: he shall be brought to the entrance of the tent of meeting, and he shall bring his gift to the LORD, one male lamb a year old without blemish for a burnt offering, and one we lamb a year old without blemish pas a sin offering, and one ram without blemish as a peace offering." Numbers 6:13-14

I agree.
“The end of the age” is a term used in the Tora. Daniel makes in clear that this will occur when the Messiah comes.

Jeremiah 31:31 Says: “The time is coming,” declares the Lord, “when I will make a new covenant with the house of Israel and with the house of Judah. It will not be like the covenant I make with their forefathers when I took them by the hand to lead them out of Egypt, because they broke my covenant, through I was a husband to them.” declares the Lord... “For I will forgive their wickedness and will remember their sins no more.”

Hebrews 8:13 adds: “By calling this covenant ‘new,’ he has made the first one obsolete; and what is obsolete and aging will soon disappear.” And so it did - during the destruction of Jerusalem and the temple.

And all of Judah and Israel are invited into this new covenant with Messiah.