Oh man, I love good sandwich board art. That stuff is always my favorite. But yeah I get not every place has a creative employee who can spend time drawing that.
However clean text on a poster or sandwich board is far superior to AI slop (both in a moral and eye pleasing sense).
Also poorly drawn pictures can catch the eye just as well as well drawn pictures either because it can be humorous or because it’s eye catching (possibly in a bad way). But people do look either way, it’s why advertising works. I hate those stupid white billboards with black text that just say “Made you look”, because it works.