I think those slides try to convey the same idea, as the famous paper "Out Of the Tar Pit" (although, I'm not sure author read the paper) Reactive and function

I think those slides try to convey the same idea, as the famous paper "Out Of the Tar Pit" (although, I'm not sure author read the paper) Reactive and functional approach don't help you to deal with the essential complexity of your problem, but they do minimize incidental complexity, the primary source of which is the mutable state.