mortar looks a little too sloppy (weaker) & what about Perps? Hard to imagine that just how the "box" slides so easily. don't think they will ever really replace an experienced "brickey"! That idea is similar or based upon the kerb making machines so will have its merits in some situations.
side track.
Funny, the Thai bricks I saw were the size of an icecream-I sent a pic back to one of my brickie mates when travelling there. He was amazed at the small size & questioned the time to lay & the strength of such skinny walls. Gosh a cavity wall would be not much thicker than a mega brick single skin walls=imagine the number of cavety ties/ or rhs to support strengthen the mass.