Well, the episode The Road Not Taken
does show a constant effort of working on the device, and not have it all of a sudden working perfectly, so, there is that.
And, it's not the last episode that will frustrate you on that front, with not doing anything to tie up the Arc. Keep in mind, Episode 10.20 (Series Finale) does not end the Arc, the First DVD Movie, Arc of Truth
is what ties up the Ori/Adria Arc.
One Day I hope to be the Man my Cat thinks I am
Where are we going? And why are we in this Handbasket?