The difference is what happens when you come to depend on it. Do you want your airplane to be flown by a pilot, or someone who's so good at talking like a pilot that they can fool almost everyone?
If they are only good at pretending to TALK like a pilot, then of course that is bad. However, if it is so good at pretending to BE a pilot that it can actually fly the plain really well, then that is good enough.
If they are only good at pretending to TALK like a pilot, then of course that is bad. However, if it is so good at pretending to BE a pilot that it can actually fly the plain really well, then that is good enough.