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Om is over engineered, Reagent takes the simple-made-easy approach.

Om has extra constructor syntax and functions for dealing with cursors; that's it. I get the initial perception that Om is "over-engineered" but it just isn't.

I actually quite like the "boilerplate" for dealing with cursors.

React/Clojurescript is a funny beast. On the one hand clj is all about immutability and referential transparency. On the other hand FRP has state baked in: there has to be something to watch, after all, and even paradigms that try and sidestep this conceptually by saying "everything is a stream" (flapjax) end up dealing with state in terms of how the streams interact, under what conditions, etc.

I like the Om model because it says: OK, we're going to have to deal with state, no way around it. Is there a way we can bring sanity to the process?

Reagent has cursors too, and the latest version is quite ok.

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