A server with TNT duping allowed permits the vanilla TNT duplication mechanic, letting you build contraptions that produce primed TNT on demand instead of crafting stacks of TNT. The practical difference is huge: explosives stop being a consumable you ration and become a tool you route and automate.
Gameplay leans into technical progression. You get slime/honey and solid redstone, build a reliable duper module, then put it to work as a tunnel bore, quarry, or blast miner. The payoff is constant, repeatable blast mining for big digs, nether corridors, and base excavation. It shifts the feel from careful manual mining to shaping terrain at project scale.
This also changes server culture. When TNT is cheap to operate, people plan perimeters, quarry zones, and infrastructure, and they care about chunk loading, cleanup, and where blasting is acceptable. The best worlds that allow TNT duping are explicit about boundaries: where machines can run, what counts as excessive lag, and how claims or protected areas interact with explosions.
