Ryujin
Legend
That's certainly true.
Well, not *infinitely*. The human will not actually be any more flexible than the laboratory you send with him or her. And that lab won't be able to restock consumables, or get new equipment in short order. Part of human flexibility lies in our social infrastructure, which doesn't exist on Mars.
A probe that is faced with a situation for which it was not designed will likely fail. A human faced with such a problem has a fairly good chance of coming up with alternative solutions. That's the sort of thing I'm talking about.