FWIW I wasn't suggesting sticking to one language exclusively, some of the biggest jumps I've made have been caused by exposure to different paradigms. But for

FWIW I wasn't suggesting sticking to one language exclusively, some of the biggest jumps I've made have been caused by exposure to different paradigms. But for beginners I think it can be helpful to keep focus in one place. There's a lot of overhead involved in a language (tooling, IDEs, best practices, quirks etc.) that can get in the way of seeing the important stuff.