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And also real life.. there's no reason why a laundromat, barbershop and Japanese restaurant have posters that looks similar

Agree, all of them in same industry mostly have similar posters. My eyes keep ignoring them and focus on service quality of barbershop and restaurants.

You know, not everyone has taste etc to make visually appealing websites. Would you rather read extremely basic text ones?

I find well prompted AI makes nice looking websites. Are they better than some designer could do?

Probably not, are they better than a guy that hasn't done a minute of fronted work in 20+ years in the industry? Probably.

WordPress or something else. Site builders have existed for decades.

By now I just want everything just to be black on white or white on black text and nothing else. Or better, just an md file.

Yet it will be worse when we aren't able to detect it as easily

what exactly will be worse once no qualitative difference is detectible?

No difference in presentation doesn't make presented slop content less sloppy.