I'm with you on the system requirements bloat. Really sad honestly. That said, I don't think the engine is more 3D than it used to be, is it? I believe it's still isometric 2D with 3D physics. Could definitely (definitively?) be wrong though.
Here's some discussion on it: https://www.reddit.com/r/ageofempires/comments/16aowwc/are_t...