You could also plan a large mod, but release each of its pieces as seperate mods that are more compatible with other things, then create your own bigger mod as one package with all the smaller mods if people want your entire cinematic universe. You would likely get a lot more support through that route, as it would create more audiences that enjoy your content, and it may make it easier to create a larger mod, as each smaller mod will like a little checkpoint in development of it.

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.

I think it's partially because of the games data structure, the same reason I haven't been able to remove the limit for Super Heavy Howitzer, Self-Propelled Super Heavy Howitzer, Land Cruiser.

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.

Why are there not like 50 of these on the workshop and instead a bunch of completely incompatible entire game overhauls? I am excited to try this. I love mods like this that remove the arbitrary limitations added in the game.

I tried that but I haven't been able to get it to work without overwriting the entire file which would make this mod not future version invariant, as I would have to have all the information from that file. Just adding "equipments = { land_cruiser_chassis = { max_military_factories = 999 } }" appears to do nothing with custom file names, and using base file names is above problem.

You can change the defines of the Super Heavy Howitzer, Self-Propelled Super Heavy Howitzer, and Land Cruiser you just need to change it in their unit/equipment files.