Well, both Wormerine and Niara made basically the same point I was thinking reading the title, so just count this as a +1 for "stealth is currently broken rather than OP".
And the idea that you can keep moving around a "battle arena" in real time when there's a turn-based combat going on remains singularly awful.
Without even going into LOS exploits, aggro reset, remaining undetectable after striking and other similar crap.
...Not sure what is even going on in this thread, on the other hand.
+1
Also, when in combat, if I went stealth mode and succeed, the enemy AI don't even know where to check. There should be at least an "alert" state for enemy's AI which if got attacked should enlarge the enemies' "see" radio into a large circle area instead of the default conical area.
