I've never though of MH being stingy with business class awards, maybe it's just a matter of routes, and in this instance perhaps timing, mid December. In my main travels (SIN-Australia), MH always seem to have some availability in business, sometimes BA do too, but it is very difficult to find anything on QF. They define stingy when it comes to business class awards.
Also, I suspect they limit availability to partners, which is becoming increasingly common across a range of airlines. Using Enrich absolutely no problem in getting 3 awards seat mid December on the route.