I usually like to have a small EDC like the Muela Rebeco, or the SS4 for skinning and other fine work, a longer blade like the SS6 or DFLE for hacking and slashing through thick brush, and a hatchet like the Estwing with a blunt head for chopping and hammering.

Sure, a large chopper blade could do a lot of what the hatchet could do, but the wider wedge-shaped head of the hatchet makes easier splitting of the logs, and the use of it as an impromptu hammering of stakes, etc. makes it useful indeed. Plus, the wood around here is seriously knotted and sinewy; a knife would be a pain to try and push through all that. I'll stick with the hatchet.