I think there are some subtleties hidden in the word 'practical'. There are differences between: My company has 200 Java engineers, and a dozen systems written

I think there are some subtleties hidden in the word 'practical'. There are differences between: My company has 200 Java engineers, and a dozen systems written in Java; it's not practical to migrate everything to <FP language>. Spring Boot solves so many things out of the box that I'd have to implement myself in <FP language>, which isn't practical. FP has a lot of features but it's not practical to maintain a large complex codebase using those features.