They asked a question: "and what shall be the sign of thy coming, and of the end of the world?"
Are you categorically saying Jesus avoided these questions, and gave them a homily on OT Scriptures? Jesus did not mention one single future event, but only repeated words from the OT?
It is clear that Jesus used language first century humans would relate to, but He was not just quoting Scripture. He was telling them about the future, and 98% of the OD is still future. The OD is about the Second Coming, not just words from the OT without any future references.
Even Paul acknowledged the "coming on the clouds" is the Second Coming. Why has that now changed in these last days, 1991 years after the Cross?
The change, the final harvest, and the angels are all indications of the end of Adam's 6000 years, the end of the lost tribes scattered across all nations, and the end of the body of Christ being gathered. Coming on the clouds, in the clouds, with the clouds, is tying the event with how they watched Jesus Christ leave into the clouds.
A narrow approach by preterist to claim it was done and over with in the vicinity of 70AD, is missing the whole point of the OD and the Book of Revelation.