It is absurd to generalise like this and tell people not to try without knowing their background and goals. While I personally don't see the point in spending

It is absurd to generalise like this and tell people not to try without knowing their background and goals. While I personally don't see the point in spending my time learning design skills, this is because my current goal is to move away from doing the work myself to managing others doing the work. Assuming your statement that only some people have artistic skills is correct, and even assuming the proportion is very low for the statement to be interesting, you're still making an assumption that people with artistic skills and sensibilities are always aware of them. What does e.g. a 22 year old "programmer" have to lose trying their hand at a new skill? They may discover a passion or talent they never realised they had and your advice would see them miss this opportunity.