I agree with you, it gets tedious instead of challenging really quick. Dragon Age has always had that problem on high difficulties though.
That's just the problem with artificial difficult however, instead of hand balancing encounters to be more difficult through skills, enemy placement and composition, ect.
My guess for the reason tactician mode isn't available in EA is that they're probably using all the play test data and player videos to develop counters to popular tactics like they did in EE.
Things like Inquisition didn't really require much in the way of tactics, just spamming everything at my disposal and waiting for either my party or my adversary to eventually stagger to an often unconvincing victory. Original Sin seems to show a bit more finesse, even though I can't say the same really applies to my playing style so unlike Dragon Age I'm staying safely on the "please don't pwn me too often" setting.
