Here are two paintings.
[1] https://cdn8.openculture.com/2018/08/22215450/sciencde-and-c...
[2] https://painting-planet.com/images/9/image293.jpg
Painting [1] demonstrates a mastery of light, shadow, and color. It's complicated. It's full of detail. Anybody who walked by this in an art gallery would surely think, "This person is a great artist" and move on. Painting [2] will most likely be called a great painting by most people, but that's because most people have seen it at some point and know who painted it. This person has a massive reputation as one of the greatest artists of all time. People who walk by this in a museum will stop and snap a picture and take a minute to really look at it because, hey, this guy is super famous, so he must be great.
But [2] is clearly painted much faster than [1] and has far less fine detail. A person who doesn't know anything about painting [2] or the artist behind it will probably say something like "anyone could do this. Even I could do that"--but it was a revolutionary style at the time because people didn't do it. [1] was merely fitting into a more established framework of art and was far less likely to blow minds, even though a typical person without foreknowledge might be more likely to compliment [1] on being a "good" painting than [2].
And many might know this, but [1] was painted by the artist when he was a child. [2] was painted by him as a full-fledged artist as an adult. The reduction in realism and complexity in favor of abstraction was an intentional progression for his work.
These simple poems don't need to be as complex as Shakespeare. They're not trying to be. They serve an entirely different purpose. People are still writing long, epic poems even today, but it's a vastly explored field of art and demand for new material in that style is quite low. Not every one word poem is going to be mind-blowing, but some definitely grab some interest. There are plenty of people, even well-read people, who find Shakespeare tedious. There are people who think a page with nothing but "cricket" is fluff. Both kinds of art can coexist.