This is very true and after rendering 100 prompts twice for https://john.hartnup.uk/poster-prompts/ I realised that the prompts could be improved by asking for much less clutter. The best examples on there pick out one main visual subject, but many of them are too fussy.

I may do a V2 one of these days.

Clutter comes with the territory to some extent though. I was recently asked to do a real world PTA fayre poster, and the client (my wife) very firmly wanted 12+ attractions mentioned on the poster. Tombola, hook a duck, bar, BBQ, blah, blah, blah as well as date, location, sponsor, ...

To get a really clean design, you need to edit it down to the essentials. I don't know what pro designers do - convince the client to say less?

Unless the prompt says otherwise, AI will try to get a visual element in for every single word too.

Pro designers are generally paid because they’re extremely good editors. And they’re an intermediary between clients and their consumers.

So when you put the capability in the hands of the client without the editing (or taste) and no way to evaluate the result, you get the passable, homogenous thing.

It mostly doesn’t matter because there’s no economic incentive for it to matter, which is why much of our aesthetic world is the way it is.