Frankly, I am not sure if they will ever actually be able to solve this problem or if it'll be a continuous game of whackamole, but regardless there's a large crowd of people out there where if they can tell something is AI generated they will not support the company behind it. Being able to tell anything is AI generate cheapens brands.
To the average HN'er, images and design are superfluous aesthetic decoration for normies.
And for those on HN who do care about aesthetics, they're using Midjourney, which blows any GPT/Gemini model out of the water when it comes to taste even if it doesn't follow your prompt very well.
The examples given on this landing page are stock image-esque trash outside of the improvements in visual text generation.