New Tribe's Altar

Why is there a need for a new tribe to officiate at the altar? Why is there no longer a need for the altar of sacrifice at which Levi ministered? The prophetic words which the writer of Hebrews is using concerns the strangeness of a tribe other than Levi acting as priest over Israel… the word for "another" is meaning completely different; completely new. Having no prior connection to the altar or its purpose, a different kind of a tribe; And with the difference in tribes we enjoy a different kind of interaction with God through the worship and offering they bring to us. With the new Tribe officiating at the altar, and at the new altar as well, we find that the impact and the effect of that officiation is profoundly changed and unspeakably superior.