Because the consultants real job is to be a glorified sales rep and you need a person to do that.
Why would “sales rep” be immune to the magical singularity AI that will be 9000 IQ points smarter than all of humanity combined?
Because most people still prefer to receive (fake) compliments from humans and still prefer to get dined by humans
That’s a cynical way of saying that maintaining relationships and trading information are the things of value. Accepting this will make any job more fulfilling- even with AI.