So it sounds like we're back to one of the big problems that the d6 system had.
I don't think it's the same. Similar maybe, but a) you can still measure dice pools against what you want to achieve, and b) this system scales far better...IMHO, which, admittedly, is limited as I didn't play D6 a lot.
The d6 has basically the same thing, here you compare dice pools, where as there you compare how many d6 each PC\NPC had. The only real difference is that everything was an opposed role in d6, but Destiny has a few set difficulties.
So in the aspect of comparing an NPC to a PC in regards to a specific task, then it is no different.
Difficulties weren't dice pools in D6. The GM set the value inside a given range (0-5 for very easy, 6-10 for easy, etc...) and depending on what was going on determines if someone could roll to change that. For example a living being could roll their Dodge skill to increase or replace the difficulty chosen by the GM. But, hacking a computer system, or flying through terrain didn't have opposed dice rolls.
Now, something like social skills would be opposed rolls, but that is the same as FFGs Star Wars. But unlike FFG's where the positive dice are slightly favored against the negative dice, in D6, a d6 is a d6 is a d6. So, less important which side of the "pool" you wind up on.