Ankylo used to auto harvest a long time back. I used to put two at the front of my ships to break the stone along the rivers and waters edge on the island so I didn't have to go as deep in Leed Whale areas or keep dodging rocks for clipping. Not entirely sure why it was disabled, but I think it was in due to making metal, obsidian and crystal farming way too easy when they were meant to be a harder to obtain resource. With Gacha's in play now and them making hundreds per hour each, I think it would be entirely fair on any server to have auto-harvest enabled on them. Gacha's pretty much obsolete Ankylo anyways as long as you keep them filled, mate bonused and 12+ tiles away from same gender Gacha's to max out production.