Healing does not effect storyline,I can not think of a real valid reason why there is no magic healing especially when the first two dragon age games had it,hate to keep saying it,but it seems like dumbing down the game ie no manual attributes,no magic healing etc...you can try to defend it but these things are expected in RPGs especially when the first two DA games had them.
I also normally play as a mage towards healing as my main character (have done in previous DA games)so that's now ruled out even before I have the game in my hands.
I'm concerned the way the game is heading,sure I've to adjust my gameplay in DA:I ,but taking options away from players is never a good thing.
Why look upon it as 'closing a door'? That is, of course a viable perspective, but instead you can also see it as 'opening new doors you may not have thought to look through before'.
You like to play healers. OMG So do I. I love the healing class. My Jedi Consular, Sith Inquisitor, Imperial Agent in ToR and Discipline Priest in WoW are healing based classes. I love the aspect of the 'support caster', feeling useful and helpful to my team mates. I love the RP of it, and the feeling that my priest can tackle any challenge with my druid tank partner (or solo even--she's pretty OP).
Now, they've removed the healing class from DAI. Okay. I freaked out when I first read it, imagining battle like that of the Arishok in DA2 where I ran around and around in circles, kiting him and taking pot shots between his charges. That's not what they've done here. Combat has been reworked from the ground up to encompass a more tactical mindset, where the emphasis is on limiting the damage you take while fighting. Some fights can be completely avoided, in fact. It's not like previous games where you went to travel from say, Denerim to Orzammar, and get that random encounter you have to fight in order to reach the other side of the small zone just to continue your journey.
I'm not the most tactical player, tending to face things pretty head on. I'll probably die a lot till I get used to the new system. I died a lot when i first started playing Origins and then DA2. I remember that Broodmother fight in deep roads being a particular PITA the first time I did it. By the time I was doing my third run, she went down like a punk.
You may say lore had healing as part of their world. Okay, yea I don't swallow the 'it's not used well in combat' excuse either, especially when Wynne and Anders make it seem so darn easy, right? But I'm willing to work around that. My RP for what was originally going to be my healing mage (Dalish elf) from healer to: "She was a healing prodigy, First among her Keeper's apprentices. She was sent to the conference by her Keeper, but something (the big bad thing that happens to make her the Inquisitor) happens. She wakens to find her magic altered. Now, instead of healing people she can heal rifts. She learns she is the only one in her world that can do that, and has to accept her role as "Herald of Andraste" so that she can continue her work. It may be altered, but her work continues."
You may feel the changes are unacceptable. I'll reiterate the advice I gave others.
1) Buy the game, try it, then haunt the boards here to tell them either 1) you did it right or 2) this game sucks
2) Wait to see what others say after playing it themselves and make a more informed choice then
3) Don't buy it at all, if you find the changes unacceptable
As the consumer, you have the final say on what goes on your PC/in your game console. Bioware can only make what they feel is the best, most fun game they can for us. It's up to us to let them know if they did that well or missed the mark, but the only way to do it objectively is to actually try it first.