Also, the whole "without builders, what will happen with harvesting?". You answered "well, it can be done in the queue" and it has been asked "so you'll spend production to gain production? How does that works?" Except that's what you do with builders. You spent production building onen to then get production by harvesting. It's just "use production to gain production" with extra steps. One thing that could be done, for harvesting, could be a "project" in the build queue, that when finished enhance the production of one tile during 10 turns (like +5 production), and after those ten turns, the resource is harvested. You don't chop an entire forest that quickly, it requires time after all, especially if you want to use the wood to produce something. You can chop a forest quickly (hem *Amazon* hem) but you'd gain no production out of it, since the methods are rather... unproductive, to say the least.