Some level of uniformity is fine and indeed the norm. It was uniform back when posters were hand painted, eg 19th century world fairs or zoo openings or theater posters. They look pretty similar. Carneval posters looked similar.
The expectation of some kaleidoscope of styles is not really grounded in how things used to be ever.
Also, it's just nostalgia, just like how some young people now think audio cassettes and discmans are "cool" and have some revival, some are nostalgic for the back-in-the-day Word posters because "at least back then", but "these days" it's decline etc. Pretty sure in a few years people will be nostalgic for crappy AI slop of 2025-26 because their shittiness will feel like some charm compared to whatever the AI will be able to do.
The expectation of some kaleidoscope of styles is not really grounded in how things used to be ever.
Also, it's just nostalgia, just like how some young people now think audio cassettes and discmans are "cool" and have some revival, some are nostalgic for the back-in-the-day Word posters because "at least back then", but "these days" it's decline etc. Pretty sure in a few years people will be nostalgic for crappy AI slop of 2025-26 because their shittiness will feel like some charm compared to whatever the AI will be able to do.