Personally I've noticed some mob stacking, don't know if this is a glitch, but I remember the last time mob stacking was added there was quite a large amount of hate. I think that the mob stacking is a good thing, but only apply it to grinding mobs, afking spawners such as Iron golems, creepers, and pigmen, endermen, and cows shouldn't have mob stacking enabled, it will simply ruin the economy as if no spawners existed before, most creeper grinders fail to work against mob stacking, cow grinders completely fail, IGs give less iron than if you were mining, and pigmen aren't even worth 10k at the rate they'll be with mob stacking. Spawners you should have mob stacking for: Skeleton Zombie Blaze Spider Magma Cube Slime Witch Chicken Pig Sheep @Tibo442 @aXed @Melon333 And yes most people won't know what I'm talking about, however today for a short period of time, maybe an hour or so, mob stacking was enabled, and I believe most if not all mobs stacked. However, at the time of this being created, the mob stacking is still on. Unsure of when it will be disabled
We intend to only activate mob stacking during busy times. Iron Golems are not being stacked at the moment we might add more to the "whitelist" such as you suggested. It all depends on the performance of the server. We can see which mobs take most of the performance so we base the "blacklist" on that. Thanks for your feedback