Sure we never "see" Gandalf cast a spell... but we know there is a lightning storm on Weathertop when Gandalf is fighting the Ring Wraiths... and I have this sneaky suspicion it wasn't just some crazy weather coincidence.
Also... there's a very clear reason he can fight a Balrog and everyone else can't.
The point for me is that magic isn't easy in LoTR or ASOIAF... it costs, it isn't flashy and it isn't common or easy.
In DA:O... magic was not common. It was centralized in a Circle Tower.... and the rest of the world had a smattering of wandering mages who never seemed to really do much. Wilhelm in Honnleath... Jowan in Redcliff.
We are presented with a VERY different magic in the Circle Tower of the mage origin than what we get by Tresspasser.
In DA:O... magic was dangerous... but by DA:I every mage just "knows" they're capable of fighting off demon possession... and, not an abomination in sight.
In DA:O... yes, there are smatterings of fantastical creatures. You have pockets of demons, glowing dragons, etc. but by DA:I spirits and demons are littering the place... the spirit realm is wide open... but the world far more resembles D&D by the end of DA:I than it does what was presented in DA:O.
In DA:O the main quests are:
- Decide who becomes King of Orzammar and get the allegiance of the dwarves.
- Unite Ferelden and get the allegiance of humanity.
- End an ancient curse and gain allegiance of the Dalish.
Was DA:O "low fantasy"? No. But it was a marked step down from D&D.
In DA:I the main quest is:
- Stop an uber mage from conquering Thedas.
- Close the magical tear into the realm of magic.
- Fight off Inky, Blinky and Clyde
- Discovery the uber mage you defeated was being played by an EVEN MORE UBER MAGE GOD mwaahaha!
I think DA:I suffers from the same thing a lot of stories do. Power creep to make the story feel "more important".
Maybe we need more than two classifications of fantasy:
- low magic
- high magic
- preposterous magic (I actually don't mind it for worlds based of fairy tale concepts - but that's not the premise of the original DA)