I'd rather not have three thousand needless processes going on in the background of the game, to be honest. Whatever optimizations that undercut the experience you all notice hasn't stuck out to me, but perhaps I'm missing something. The only features that have been stripped out in favor of optimization I can think of is zombies no longer being able to trample farmland (when it existed), the removal of concrete drying (this was a mistake), and the smell feature (another mistake). Aside from that, optimization features like having the insides of buildings occluded when far away theoretically would be a massive performance boost in places like the skyscrapers.