I agree that the DT armor is a good way for the casual player to get some decent armor. That being said, they need to implement something that works for the not so casual player to get what they want, not a lottery system. Personally, I have burned at least 70-80 Eldritch looking for the +5 resists and have yet to get it. That was just on one toon. I got so exhausted from that I have not even started on some of my other toons. So, I just settled on something that is acceptable. I kind of gave up since I got bored and there are less groups running those quests now.
Which leads me to another point, since there is only a few 'good' combinations out there, once you find something you like, you are more likely to just stick with what you have. Therefore, less people are likely to run those quests after finding an acceptable combination which leads to less people doing SoS runs which means less pug opportunities, which defeats the idea of a good way for casual players to get good armor.