

A recession is generally defined as two or more quarters with negative GDP growth.
Tariffs will absolutely cause that. They’re going to dampen US growth for years.
That’s only one simple definition though. Broadly I think the answer is still yes, this will cause US job losses, as you’re already seeing in the automotive industry. Job losses result in lower consumer spending, resulting in lower business revenue, and less business expansion and cost cutting, and it can become a reinforcing cycle.
Recessions can be mild or severe, so the jury is still out on whether the US will hold their tariffs, and how quickly the system adapts to the changes.
The of the ideas of functional programming have gone on to influence the field.
Algebraic data types and monads are used heavily in Swift/Rust/Scala/Typescript.
Concepts like left/right associativity and pure functions are critical to the entire MapReduce paradigm of computing. Apache Spark, pandas, and the entire dataframe programming paradigm is basically functional programming (though most people suck at pandas and treat it like an object oriented tool).
I think a lot of React is also heavily inspired by functional programming, and modern concurrency schemes are inspired by functional programming.
F# and Haskell didn’t win the language wars. I’ve worked on one erlang project and it was neat, but I think you’re right, I mostly see MVC apps.