Python is better than Ruby

You can not override builtin data structures.

Begging The Question

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Python is better than Ruby

Ruby is a type of mineral, which forms over billions of years. Pythons live and die many generations per generation of Ruby.

False Analogy

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Python is better than Ruby

Ruby is a caveman language for garbage people

Prejudicial Language

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Functional programming is not useful for most apps

Elm

Irrelevant Conclusion

No argument.

Functional programming is not useful for most apps

features and principles from functional programming (e.g. first-order functions, immutability, monads) find wide application in established and new programming languages and at a higher level in system design (Google MapReduce, Twitter Finagle etc.)

Appeal To Authority

The use of FP (or any other paradigm) in x or y doesn't support any argument in this case, as of today most applications are written in another paradigm.

Functional programming is not useful for most apps

Some impressive results are being achieved with functional languages today. For example a recent success in this area is the Amazon competitor Jet.com. Functional languages are increasing in number and popularity which shows increasing applicability to real world challenges.

Appeal To Authority

Just because Amazon or some other company was successfully using it doesn't mean it supports the counter-argument. One could also count every other company that uses an other paradigm... Nothing argumentative achieved by this.

Static typing is better than dynamic typing in programming languages.

Some consistent and logic domain models can not be crafted in most static typed programming languages.

Slothful Induction

Thats simply not true. Turing complete languages are equal in expressiveness. One could for instance just use the topmost Supertype or Stringify everything to express the same as in dynamic languages.

Static typing is better than dynamic typing in programming languages.

Good design and documentations is far more important for large team, big codebase development.

Irrelevant Conclusion

"Being easier to manage" includes managing documentation and design. "Being more important" is no counterargument.