“but I grantee you that if I want to use Node.js in those days I’ll use TypeScript transpiler with webpack (+ ts-loader plugin)”
You could, but you don’t need to. You can go great without it.
“with karma & Jasmine testing (or whatever)”
At this point, i agree that you will be using it on both sides, but i believe this is good and not bad.
“and others will use babel (+plugins)”
Take a look at http://node.green. The current version of Node.js which will be LTS (6.*) has a great support for a lot of the “new” features. I don’t see the need of using transpilers, and having an extra build step. I never used it in any Node.js project.
I think we are not seeing so much of “fatigue” articles related to JS with Node.js, because there you are way more free of these kind of dependencies.