1. Mobility: humans are more mobile than probes. This ignores the fact that, for a fraction of the cost of sending a human (say 50%) a robot could be developed and sent which was far more mobile than a human. Robots also don't need to be trained or selected - astronauts have a fixed cost per unit that doesn't reduce significantly by volume - 10 astronauts cost approximately 10x as much as one astronaut. Whereas the per unit cost of a robotic probe reduces per unit at volume - building 10 probes doesn't cost 10 times as much as building a single one.
2. Presupposing that humans are better at drilling than robots. However, this fails once again to take into account that the constraint is the size of the drill - human missions require larger rockets, which coincidentally allows for a larger drill to be carried. Robotic missions launch with smaller rockets. Solution: use the big rocket. Launch a couple of probes at once, with big, capable drills. No need for the spurious meat bag attachment.
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