I don't know if that is the only reason. I mean Quake had quite a good set of mods pretty much written in C++ type of code. More recently you can find modded se

I don't know if that is the only reason. I mean Quake had quite a good set of mods pretty much written in C++ type of code. More recently you can find modded server for games using Python or LUA for their game logic, official or not.