I think that you're joking, but if you're not joking, well, we have different definitions of simple.
You threw down a URL to a framework I don't know that is apparently similar to a framework I don't use and runs on Clojure, which I don't work in and none of my codebases run in. You did that with no context or even taking the time to explain why I would do such a thing.
Objectively, there's nothing simple or expressive about the samples on their homepage. Their demos are simplistic (todo?! seriously?) and do nothing to convey why someone would express a complex web app in this manner.
It seriously looks like Matrix code to me.
Wow! Indeed our definitions of simple are different.
If you have anything more substantial to add to the conversation that actually relates to my original comment, I'll be here.
https://reagent-project.github.io