I don't think DA2 healing trivialised content.
DAO healing was really bad, but DA2 healing was pretty well thought out.
I don't mind DAI healing. Though I think lack of healing has maybe made non-tanks overly squishy and created too much importance for tanks/barriers. And in main quests it's a little odd to be so reliant on the rather arbitrary placement of supply caches - and can be very frustrating if you happen to miss one of them.
When I played my DW rogue, I never thought of my self as "too squishy".
You gotta keep in mind the whole picture. With the taking away of healing spells, all three classes were given ways to simply avoid the damage (if you're good enough) or mitigate the damage.
Mages were given barriers, fade step, supreme CC and simply the knight enchanter specialization period.
Warriors were given guard, combat roll and many many many many many mitigation talents
Rogues were given supreme ability to simply avoid getting hit in the first place. Speaking of rogues, at first I hated the class but once I got used to it, it became very hard to actually get hit by something.
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In the end, BW chose strategy over healing spells. And as I said before, at a certain point, even the healing potions/bombs/regens pots become overkill.