EE has unlocked a ton of stuff for modders & module developers. Beamdog has basically turned over development of the PC version to the community & it's been busy unhardcoding & adding new functionality, the biggest & most obvious change being recently providing an update for custom shaders & having 8 class slots instead of just 3.
Arc is having a lot of issues with older games as well. I can't run Quake II RTX in raytracing mode & the Neverwinter Nights toolset doesn't work either.