That's like a mathematician saying "people shouldn't learn maths!". Of course they should, it teaches you other skills on top of learning maths. Are most people going to go on to learn cryptography or crack one of the Unsolved Puzzles of Maths? Of course not, they'll leave it where they are and have new skills and new ways of solving problems.

Of course they could be one of the minority and go on to solve one of the big problems and create huge amounts of value. Which would be terrible.