If you ask me what the ascension is so important I can’t tell you. In fact, it’s something I’ve been thinking on. Why? Why the ascension?
It really was one more form of his divinity. Because Lazarus was raised from the dead and he did not ascend. Others were bodily raised from the dead and they did not ascend.
But Jesus was not them, and he ascended.
We know it’s important because the Scriptures record this event.