[Drup]

> trendy crap

> 80 year old concept that has spanned dozens of programming languages.

I don't even disagree with you, the "throwback to the roots" thing is not very useful most of the time, except for intellectual curiosity.

lambda calculus is still extremely useful for Prog lang theory, though, because that's the simplest thing you can imagine. If you want to prototype your fancy new type system or weird new execution model, you always design it on the lambda calculus first.