After a few thousand years of 'design tweaking,' the axe and hatchet have evolved as the optimal hand tools for push cutting, whether chopping while extended or doing more precise work while choked up, for example, skinning a deer. You have a lot of control -- more than you get with a comparable mid-sized knife -- yet you also have more blade weight than a ~3" knife to help with finer push cutting. For the same reason it's very handy for food prep in a camp (or home) kitchen. I think of the GB Mini as an ulu with a handle for hatchet duties.
As a hatchet, my wife and I use it mainly for splitting wood for fuel and kindling -- batonning and light, easy chopping -- where its profile works better than most knives. Choked up, it's also very good for making fuzz sticks for tinder -- push cutting again -- which shouldn't be surprising given its fine convex edge. Personally I still find that simple carbon steels work and 'feel' best for wood. With a strop it's really easy to maintain and restore a highly polished edge that 'bites' wood.
For sectioning wood, we generally saw instead of chop, which is why I prefer the Mini to the Wildlife. If I'm willing and able to pack more than a Mini, I'd go with a small forest axe. Personally I find the Wildlife a poor compromise between the Mini and the SFA. For weekend treks or even long day hikes, I often pack the Mini, a Gerber sportsman's saw, and a Vic Farmer -- combined less than the weight of a Wildlife.
All that said, the Mini is stupidly expensive, even if it is harder to forge. The prices of all GBs spiked a few years ago due to demand outstripping supply which, in the US, was exacerbated when GB's gateway distributor here burned to the ground. A LOT of inventory was lost. I'm glad I got two Minis for ~$75 a few years ago, before the huge price hike.