There are currently no ascended items in the game that can only be obtained through guild missions. Fact.
Yes, it is faster to get your stuff with guild missions, it's even faster if you combine both methods.
You actually both agreed on that:
So what is the issue? That ANet implemented a carrot-on-a-stick so that more people would participate in guild events, even though you can get the same carrot from at least one other (albeit slower) source?not nearly as efficient time wise i admit