Coding was never the hardest problem. And it is hard to say why people are taking so long to realise it

People who don't know how to code know they don't know how. They can look over your shoulder and see that it looks like gibberish, and they also have no interest in understanding it even if they could.

On the other hand, designing the software or engineering a solution to the problem seems like something they could do, as far as they know, because it's not something concrete that they can look at and see is beyond their abilities.