Temporarily, not permanently.
With full artifact knowledge, you will be getting mind-boggling amounts of artifact power for, well, EVERYTHING. The only mandatory commitment an alt has right now is keeping up with artifact knowledge. As they put up more things to spend AP on in later patch cycles, I can bet you they will also increase means of acquiring AP and catching up with AK. There is little doubt in my mind that I could create 12 characters, 1 of every class, 6 months before the end of Legion and have ALL 36 weapons fully powered before the next expansion. People are underestimating AK because we're still so early on and so far away from full AK