Seems like you have bad experiences with functional programming, but it's a little strange to rat on the advocates that are trying to figure out how to take potentially useful functional programming concepts and make them mainstream and/or explore alternative ways to quickly build robust systems.

Good examples of this translating to huge gains for the overall community are React + Redux.

I'm quick to admit that functional language ecosystems are not as mature, which might lead to lesser organizational productivity but no need to rat on functional programming in general.