I have chosen the Tactician difficulty, because I like being challenged, and at times I still find the game too easy (and I started with nary a clue about how to play, I figured out you can jump halfway through act 1). But several fights provided nice, solid challenge and it keeps me hooked. I like that I had to use some items at my disposal, some positioning. I hope those difficult battles keep popping up (obviously not every single one should be that, respite is needed and nice).
That being said... if the easiest mode/story difficulty gives people problems, it should be nerfed. It's literally there to allow people who *don't* want to think in combat to be able to play and enjoy the game, isn't it?
I remember playing games when I was younger and a complete n00b, I didn't know the value of CC ("it does no damage, useless"), I didn't think of positioning ("they go together in a formation then okay, they stay that way"), I always kept my items "for later", barely noticed what gear did, etc. etc. etc. Some people just don't care to/can't get involved with the system and I think that's fine enough, let them have a mode where they hit half their team cause they thought they had to click on an enemy, and still win. For everyone else there's the balanced difficulty, which has to make sense and demand something from the player.
I played a game once where I just wanted to rush through the story. I picked the easiest difficulty to *not* be bothered about the systems. I didn't engage in crafting whatsoever, I put on whatever gear had a better main stat at a glance without a care in the world, and I just ignored everything else. And that was what I wanted from that game. That's fine too.
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tl;dr: If people for whom the difficulty is made think it's still too hard, it should be nerfed. It won't affect anyone else looking for a balanced or challenging gameplay.