During the Seder we recite that every person has to feel as if their very selves left Egypt.
Why is not enough to recall that it historically took place?
We say that מתחלה היה עובדי עבודה זרה, ועכשיו קירבנו המקום לעבודתו – At first, they worshipped strange idols, but now Hashem drew them near, in His service. This is of huge significance. This is when the transition occurred; we ceased to be slaves, and became a nation free to serve Hashem. But what is ועכשיו קירבנו המקום לעבודתו – but ״now״ Hashem drew them near, in His service?
It is precisely for this reason that we are enjoined to feel like we personally left Egypt. In the same way our ancestors had an Exodus that transitioned them into servants of God, we each need to experience our own personal exodus, every year, and renew our own commitment.
At the end of Maggid, we say the opening two paragraphs of Hallel, and yet no Bracha is said on it. The Emek Bracha concludes that there is no bracha because it is not a Hallel at all! A Hallel commemorates a past event; but this is the “present”! In the names of the parts of the Seder, Hallel is after the meal – the opening two paragraphs take place during Maggid, because they are actually a Shira – a song of praise, like לפיכך – the Shira at the miracle we have to see ourselves as going through!