The devs have actually stated (I believe it was in a CC video/customization video recently) that if you desired to only loot - you can still loot. You'll get some of the best items in the game by loot - but that'd be from late game content/enemies (like dragons). To customize that armor further, you'd have the option to outfit it with dragons scales (or some kind of dragon item) and that'd make the item better. But other than that, the items you get from looting are still on par with customizing.
As for the health regen, I find it incredibly interesting you thought DA:O and DA2 allowed you more freedom in bringing along whoever you wanted. I found the opposite to be true - especially my first couple of runthroughs of the game. Anders was the healer. Aveline was the tank. I felt like I had to bring them along.
What I, personally, like about DA:I is the lack of forcing you to bring someone. I could potentially have a party full of rogues and just have damage mitigation potions/items. My DPS would be off the charts, but my team would be squishier. Or I could bring a team of mages and CC everyone to hell. Or I could bring a team of warriors and take any damage thrown my way. Then there are balances within that system - bring two mages and a tank. Bring a rogue/mage/offensive warrior, or bring a mage and two rogues.
I don't understand why you might feel that DA:I composition restricts who you bring with you. Without the game being balanced around a healer - and rather balanced around potions, this allows some freedom seeing as everyone has access to potions. There's a fast travel option, so you can easily get back to a camp should you be exploring. If you're in a cave or dungeon, that just adds to the challenge of the game on harder difficulties.
I actually saw them commenting on the loot during the QA for the crafting system and it did lay to rest several of my concerns on the matter. Again, just because they had been preaching on the crafting so much, it was a minor concern for me.
As for the health-regen issue, I actually didn't write that I found DAO giving me freedom of how to bring along, as I felt it actually really required the tank and the healer for majority of the large battles. I wrote that I didn't feel the need to bring them along in DA2 outside of few of the biggest optional battles. I guess I could write I am as surprised that you felt the need to drag Aveline and Anders along everywhere to get through. I personally always felt that that need is more based on the traditional approach to party tactics present in DAO than what DA2 actually requires for the battles as long as you follow what is happening around the battle field.
As for your vision for DAI, it might be true, it might be not. Unless you are one of the developmental team, I guess we both know equally much about the damage mitigation system in DAI and based on that, for instance I'm not completely certain why you feel you would survive with that whole group of rogues. Yeah, there are potions, but they are in very limited amount and your group does not actually heal between battles. Based on that, to bring them along the longer plot missions would seem just kind of asking for punishment and, by the way, would actually be a pretty valid approach in DA2. The only three damage mitigation systems we have been told so far, at least from what I have seen, is the warriors taunt system, which is a part of the role of a tank, and the barrier cast by mages. Which raises the question if you need to drag along a mage to cast barrier on your party in order to not take too much damage to effectively continue on on the mission, how exactly is that different from needing to carry around a mage to heal you during the battles.
Again, I realize they are altering the game engine to suit the non-regeneration. What that will end up being is difficult to say, I may love the end result or I may find it a drag. I have seen a lot of theories thrown around how the new system will work, with a lot of jumping in to conclusions about awesome it will be or how it will make exploring miserable backtracking. The truth, though, is that none of us really know before playing the game. The point of my thread wasn't to complain, but rather voice a concern I'm having at the moment, especially since we are going to have the largest party so far in the games and I would find it kind of sad if I couldn't use them as much as I would like because I need Cassandra to be the tank or one of the mages cast the barrier.