This is the ALPHA.
There have been ZERO major patches since the release of the Alpha.
Balance will come in time.
Certainly a new difficulty is coming, but week 3 of the alpha, before any balance patches or mechanics tweaks is not the best time.
I received an answer from Raze: "The difficulty of Classic/Explorer will be balanced as Early Access progresses (improvements to AI, changes to stats, etc), and Tactical and Honour Mode difficulties will be added at release."
We will have harder difficulty! Great!