Okay, I think this issue needs a proper posts, so that everyone can put to words how they feel about the current state of the game.
On average, the game duration is far lower than we expected, and I truly think this is what should be the focus of the next major update.
First of all, the majority of the game happens in the same place. A big place, sure, but the same nonetheless. This means that whenever you complete the EA, you just replay the same area you just finished. Having one more act (assuming it looks different than the whole farmland section) would help each new playthrough feel more refreshing.
Besides, whenever new classes will be added, we'll have to start over to try them out. Adding more story content first would really help preventing us from being burned out of Act I.
I really had a blast playing the EA, and I will do it again (Moirai's codex need to be completed), but I have to admit I am a bit disappointed especially considering the delay (though I can totally understand you prioritized polishing instead of adding content)