I have a fuel injected 511 that would be a rocket but doesnt have the juice for heated gear would require some major comfort mods like a fairing seat.
Honestly the biggest reason for me is that I don't want to wring its neck for 5000 miles and risk blowing the motor. Dakar bikes have factory support I don't.
We're not out here to rough it. We're here to smooth it. Things are rough enough in town.