Just looked up the 3 stage deal, it peaked my interest! Apparently there’s a couple manufacturers that have them (cub cadet / Troy built). The third stage is a small screw type auger in the center of the two main augers that breaks up wet, clumpy, or icy chunks and pulls the snow into the fan. So basically you have your main auger that pulls the snow to the center, another in the center that pulls it into the fan, and then the fan to eject it out of the chute.
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Wonder if Lorenz makes one, lol. The only blower I own is 84” wide, 30” tall and 68 hp isn’t enough to take a full swath without stopping! And yes I had to break it out yesterday to clear out a couple drifts! That meant I had to drop the 3 point blade, hook up the tiller, move it out of the way, unhook the tiller and go back and grab the blower in the back corner or the shop. I wasn’t planning to blow snow in the middle of Oct!