Esoteric languages are intriguing and can make you go 'Hmmm...', but what can we really learn from them? Is there a benefit to spending more than 5 minutes trying to write an application in an esoteric language? Have you tried one, and if so, what did you learn?
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Some esoteric languages are important as practical demonstrations of the fundamental concepts. Unlambda allows to play directly with the SKI-calculus, Brainfuck clearly shows the complexity of the Turing machine, Malbolge is interesting in terms of reasoning about the Turing-completeness, etc.
Turing Tarpits teach us how much of the languages we use in everyday programming is syntactical sugar. If you look at one-instruction assembly languages (e.g. subifzjmp a b c which subtracts the contents of register a from register b and branches to c if the result is zero) or jot (any binary tree of unlabelled nodes is effectively a valid program in a certain combinator calculus) you realise how complexity emerges from virtually nothing.
Then you go back to C++, Java, Python, or what-have-you, and are grateful for having three or four styles of loop and the ability to break the problem down into separately testable components.