First of all, The List is dead
Feast and Famine helps against combo decks, and since we have so many instants and flash threats, it allows us to use our mana twice on most turns
While other Legendary creatures act as direct burn (Heartless Hidetsugu, Toralf, God of Fury) or damage stackers (Torbran, Thane of Red Fell), today's general functions as a walking damage amplifier
It resembles Chaos Warp, a card that has long been a staple in the format
More importantly, these cards dont exile themselves upon resolution like modern extra turn spells do, which means all the Regrowth effects and Snapcaster Mage variants you can justify stuffing in your deck become much stronger
And once youve slowed down their board development and you have enough mana rocks to break the symmetry, Armageddon will stop your opponents from interacting at all for several turns, while you continue to build toward a win