Well, you don't always want to buy something based on what happens very infrequently, like a +2' snow.
I run a 74" blower on my 40 engine hp, 35 pto hp, gear tractor. Deep, wind packed snow takes every bit of power it has in low range 1st gear. It really depends on the density and moisture content of the snow as much as the depth.
In really heavy deep stuff, it will bog down enough that I put the clutch in and let it clear itself and build up the rpms again before continuing. You wouldn't have that with HST, so it should work but it will be slow going sometimes.
A wider blower is nice for getting up close to things with the blower and not the tractor wheels. It is more width swinging out behind/beside you though in tight turning areas. The driveway can get pretty small with a FEL on the front and a blower on the back. It would be easy to scrape something with the FEL bucket while looking back steering for the blower. So far, I've avoided that.