While I agree with most of what you say, this opening is going to lose you a lot of allies.
D&D is far from the ultimate RPG environment. It's just been the most successful, historically. There are other, better systems.
But I agree the way DAI handles inventory is absurd, and the mechanics would be vasvastly improved by being compatible with tabletop play (thus being symmetrical, and allow for diverse builds, and be exhaustively documented).
This game needs documentation.
D&D is not the ultimate, depends...
Regarding role-play, the part that does not interest me, since you can roleplay with no rules at all even having sex with your girlfriend, yeah, it is not much of a useful set of rules
But when it comes to combat no system presents me this perfect mix of freedom and limitation. There are so many classes, feats and equipments documented that I can build any character that comes to my mind. When I thought there wouldn't be a class for what i wanted, there was the battledancer, then I thought no this time there will not be, Heartwarder, then Thrall of Malchanthet, cloacked dancer, spelldancer, master of masks, and even the return to a classic like shadowdancer when I wanted to make a godkiller in NWN2. Speaking of godkiller this option for a 4e rogue was amazing and I loved it.
So yeah, no other system gave that. The freedom alone, well, a LOT of systems offer a lot more freedom, but this much freedom with this much documented rules, no, I've never seen or heard of. I don't care about it being broken, which it is, as much as I don't care in a SP game like DA. It is not a good system to roleplay, not even for battle, it is ridiculous for both in fact, but since all I care is how much CHA and DEX my battledancer will have and which feats represent me best... PERFECT SYSTEM.
Pathfinder gave me the same, or perhaps even better set of options+rules that I love so much. I prefer Pathdinfer world, I like the mythology, the planes, the planets, well all those things, but still I don't have anything close to any of the exotic classes from 3.5 I love so much =(
Even in computer games options are not great, that's why the only one I really love (without mods, vanilla) is Neverwinter Nights 2 (with all expansions), the only one that someohow represented the magic of 3.5 freedom+rules in some way. Star Wars with 3.5 mechanics = amazing.
Everything becomes amazing with 3.5.
So I will agree with you that for the purpose of combat there are better systes, for the purpose of roleplaying, there are better systems, but no system comes close to this perfect mix of freedom+rules, it is a lot of both, systems either go freedom or rules in each of their characteristics, at least as far as I know, when one is great the other tend to be weak.