I'm trying to complete the achievement "Sets Appeal", but I've had no luck finding someone with any of the full sets so far.
In return for providing me with the set for the achievement (which you'll of course get back) I can open a number of rifts for you (up to 40 with my current key fragment stash) and/or powerlevel a character through T6 boosting.
If that would be true, how would the achievement be possible? Don't the new sets drop in their place? And you can't stay level 60 anymore, thereby lowering the chance to get a full set in case the old one still drops.