Good luck with that in DD, especially at Bitterblack Isle.
I didn't say you do the same thing in DD. I said DA:I when you don't make use of the pause and tactical options such as ordering your teammates to use specific skills in specific spots or on specific targets, plays like DD.
It's mostly skill based combat as opposed to Dark Souls weapon moveset based combat, you play with a group of NPCs(although in both games you can play solo if you wish), it's class based with classes having clearly defined roles, it has open world encounters albeit not randomized.
The game still plays differently obviously, cause it's not the same game, but it's similar enough, and tactical mode aside, it's closer to DA:I than say Dark Souls which is generally what some people compare it to.
As for difficulty, unless you play on hardmode, a lot of DD can be facerolled by mashing one button over and over, especially if you build your pawns correctly. Not every class or every boss, but a lot of stuff can be beaten entirely by climbing on top of the monster, then mashing Hundred Kisses until it dies, using consumables to fill up stamina if needed. Or you can be a Mystic Knight and just Canon/Canon/spam Full Moon Slash and basically kill almost everything in the game.
On hard mode, more finesse is required due to getting hit like a truck by about everything, but on normal the game is hardly a challenge for a bunch of classes. It feels good and is very fun, but you'll rarely die other than running around at low level in higher level areas. This is especially true before BBI, but even BBI on normal if you're 100+ and using a strong class with good pawns, doesn't present much of a challenge other than the optional boss.