I would agree with 4shorts and others about being able to get work done with these small machines, and particularly the need to have enough weight. A post hole auger is NOT enough weight on the back end of a BX to make much difference, though. Adding a 48" box blade (weighs about 400 lbs), plus fluid in the rear tires (100 lbs, give or take), plus an "appropriately robust" operator (225 lbs or more), will make your BX quite a bit more useful. Having lug tires instead of turfs is also helpful for traction. And that box blade is a great tool for dirt work. Were I to do it over again, I'd go for the BX + backhoe since that's the perfect tool for dealing with stumps. But that's water over the dam now for me; my little BX has done everything you've mentioned plus mowing for more than 10 years now. It really shines for work in confined places like the yards you showed.