It wasn't so much about ditching Lein as it was taking a clean-slate opportunity to learn and understand the new CLI tooling.
Nothing wrong with Lein at all!
Knobs and dials: this is true of every eco-system, wouldn't you say? Is 2018 the year of the linux desktop, finally? :-)
I agree that Clojure has a lot.
Right assumes a known context. Do what is right for you. Sometimes, that's Knob A, and sometimes that's Dial B. The fun is in figuring it out.