The witcher doesn't demonstrate this because it doesn't put anything on its head. It follows the same groundrules allready in place from the first game.
Perhaps it's my bad for not wording it clearly enough, so let me try again.
DA 'putting everything on its head' produces a system with number of abilities about identical with what Witcher has to offer. If the Witcher allowing the player only few abilities in combat doesn't produce dull gameplay, there's little reason to claim that DAI offering the player similarly few abilities is somehow going to produce dull gameplay, unlike the Witcher.
Whether previous versions of DA offered the player more abilities is irrelevant in this particular tangent. If the only complaint you can muster is "but it used to be different!" then your problem isn't with the actual mechanics, but with the Change.