God has had a Plan in place from the very beginning—and not only was the Sacrifice of His Son the vital initial component of the Plan from the beginning, but God has had a Plan in place for those who would be called to accept the Sacrifice of His Son and to conform, transform, their lives in preparation for God’s holy world-ruling Kingdom—initiated at Christ’s return.
With all of the other Holydays—Annual Sabbaths which God has ordained and commanded—it is simply a matter of looking at a date on the true calendar and then one knows which day to keep as the commanded Annual Sabbath.
But not so with the Feast of Firstfruits. This day does not occur on a fixed date. One must count—beginning with the day after the Weekly Sabbath of the Days of Unleavened Bread—in order to ascertain which day is the Feast of Firstfruits.
Why would God instruct His people to count, in order to identify and keep this commanded Annual High Sabbath?