Its ability to quickly grow out of Lightning Bolt range and filter away excess Lands makes it a premium option for decks like Izzet Murktide
You'll be more likely to pull into that tutor that will help you combo off
At its most basic, the arguments against Fallen Empires are the facts that it was easy to obtain as sealed product after 1994, and that it's inherent attainability makes the deck building process much less involved
If one of these lands is entering at the same time as a "shock land" (a cycle of lands originally from Ravnica block that allow you to pay life or have them enter tapped), use the life totals of all players before choices are made for that shock land's replacement effect to determine whether the land enters tapped
With SCG CON Summer in the books, the current chapter of the Modern format concludes, and a new one will begin with the release of Modern Horizons this Friday
This sees a little sideboard play in Modern and Legacy, though, so theres a chance