With the changes to disease and lizards, every grass tuft dug will turn to rot or get turned to lizards. The ignorant hunt geekos instead of leaving them alive. Or grass tufts get transplanted to some fool's base that goes up in flame in summer or to some troll's torch. In a survival server that lasts over hundreds of days there can be a grassy beefalo biome that's completely without grass forever. And what are we left with? Everyone moving to the desert for tumbleweeds. New joining players dying to darkness and freezing because they can't make a torch or campfire. Basically, it's a graveyard.
Grass is the most essential crafting tool. With grass being non-renewable there's a problem in the long run.