Probably significantly harder. Open source tends to have a lot of churn and breaking changes. That’s more work to keep mods working. If the interface isn’t there for a mod, it could be added, but that’s more work for the modder.
I say it’s orthogonal. Like others have pointed out, the important question is whether the game is structured in an easily extensible way.
If the interfaces are stable (or at least versioned and changing relatively slowly), you can mod the game easily. This holds for OpenXcom just like for Skyrim.
If the game is not designed to be modded, modding will be a lot harder and mods will break frequently. Then even slight changes can end up breaking all mods. This holds for any mod-unfriendly have that gets updates.
Probably significantly harder. Open source tends to have a lot of churn and breaking changes. That’s more work to keep mods working. If the interface isn’t there for a mod, it could be added, but that’s more work for the modder.
I say it’s orthogonal. Like others have pointed out, the important question is whether the game is structured in an easily extensible way.
If the interfaces are stable (or at least versioned and changing relatively slowly), you can mod the game easily. This holds for OpenXcom just like for Skyrim.
If the game is not designed to be modded, modding will be a lot harder and mods will break frequently. Then even slight changes can end up breaking all mods. This holds for any mod-unfriendly have that gets updates.