If that didnt win the game, The Argent Etchings finishes off with a board wipe that kills every non-Phyrexian
Secondly, you have to invest a little bit of tempo to get back that huge swing
Archmages Charm is extremely pushed, a solid permission spell, a good way to build card advantage for hitting land drops, and a fantastic tool against Deaths Shadow, Wild Nacatl, Goblin Guide, Pyxis of Pandemonium, Champion of the Parish, Aether Vial, Delver of Secrets, Hardened Scales, Amulet of Vigor, Benthic Biomancer, Glistener Elf, Noble Hierarch, Viscera Seer, and sometimes even Hexdrinker (just to mention a few)
Sure, it may be fun to completely dominate the game as fast as possible, but it comes with a couple of down-sides, as it tends to get stale after a while, as well as not being as fun overall when compared to a slower and more intense game