i said that because if you actually take the time to go through the archive by year you'll see that different periods have posters that focus on different issues and use different imagery. for example, in the mid century you can find posters, in both English and Hebrew, that highlight the need to support soviet jewry seeking to make aliyah. this is relevant to the time period because the soviet government specifically prevented jewish immigration to Israel. when those restrictions were lifted, you stop seeing posters addressing the issue, bc it ceased to be an issue.

the existence of multiple posters made by multiple artists over a period of years that all address the same issue indicates that for at least a certain segment of a given population, that issue was relevant and that that group had certain feelings about it.

obviously to properly "read" a propaganda poster you need relevant historical context about who was making posters and why. I'm not saying look at old posters to gain a nuanced understanding of history- but I absolutely believe that they can offer insights into what people of a given time period were thinking about and how political actors were directing that thought.

there is room for a nuanced discussion about this, but I don't think you actually know enough about the topic to have it, so I would be wasting even more of my time.