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You might be overwriting all tanks/artillery in the game, maybe even the tech tree, but are you changing the number of states in the country, max factories per state, shapes of territories, or even adding new countries with focuses? There's a lot of potential compatibility. I guess different mod authors ignore the compatibility and aim for the larger scoped mods.
To fix them I need to overwrite the whole data for every tanks/artillery in the game and if you have to overwrite all that stuff anyway even for a minor change, people think I might as well make a bigger mod.