You seem to have forgotten the latest hotness yarn, which is indeed less than 6 months old.
Yarn will save you 10x the time you spend configuring it from using it just once. But go ahead, keep using NPM, new stuff is scary.
The churn in tooling is unavoidable even if you use slightly less fashionable frameworks.
I'm not claiming that all those transitions were for the best, far from it, but the real question for any language community to answer is: "how much churn is acceptable in the pursuit of better?" JS is an ongoing cultural experiment in seeing what happens when you turn that dial to 11.
And realistically speaking, yarn is not a discernable improvement over npm.
The cultural experiment has a huge cost to programmers and it's been an utter disaster. Even PHP has leapfrogged javascript.