Babel became more interesting to me once ES2015 stopped feeling theoretical.
The new JavaScript features were useful, but they also created an awkward gap. Developers wanted to write code using the newer language, while real projects still had to support browsers that did not understand all of it. Babel sat in the middle of that problem. It let developers write the JavaScript they wanted to write, then convert it into something safer for the browsers they needed to support.
Babel 6 made that conversation feel more serious because it changed the tool from something that transformed code into something closer to a platform for JavaScript tooling. That sounds abstract, but in project terms it meant the build step was becoming more deliberate.
The Benefit Was Clearer Code
The first reason to use Babel is not showing off new syntax.
It is writing code that is easier to understand. let and const make intent clearer. Arrow functions reduce noise in small callbacks. Modules give files a more organised relationship with each other. Template strings make certain pieces of output easier to read. These features are useful because they make the source code closer to what the developer meant.
That matters on long-running projects. A website can start with a small amount of JavaScript and then slowly become more application-like. Filters, dashboards, search overlays, account areas and API interactions all need code that can be maintained. New language features help, but only if the project can use them safely.
The Build Step Had To Be Honest
The cost is that the browser is no longer reading exactly what the developer wrote.
That is not necessarily bad. Sass already creates a similar separation between source and output. The important part is being honest about it. If Babel is part of the project, the project needs to explain how it works. Where does the source JavaScript live? Where is the compiled file created? Which browsers are being supported? What command rebuilds the output?
Without those answers, the build step becomes fragile. A developer may edit the generated file by mistake. Another may run the wrong version of the tooling. Someone may deploy source code the browser cannot understand. None of those problems are caused by Babel itself. They are caused by treating the tooling as an afterthought.
Babel 6 Made Configuration More Visible
The move towards plugins and presets made sense, but it also required more care.
Previously, it was easier to think of Babel as one thing that transformed modern JavaScript. With Babel 6, the project needed to say which transforms it actually wanted. That is a healthier model in the long run because it avoids carrying unnecessary behaviour, but it does ask developers to understand their setup more clearly.
I like that direction because it matches how I prefer project tooling to behave. A build step should be explicit. If the project uses ES2015 features, React syntax or experimental proposals, those decisions should be visible in configuration rather than hidden behind a vague command.
The Risk Of Moving Too Early
I would still avoid adding Babel to a project unless the JavaScript justifies it.
A small website with two simple interactions probably does not need a full modern JavaScript pipeline. Adding one might make the project look more current, but it could also make future maintenance harder. The decision should come from the complexity of the code, not from the desire to use a newer tool.
Where Babel earns its place is on projects where JavaScript is becoming part of the structure. If modules, reusable components and more complex state are involved, then using modern syntax with a clear build step can make the project easier to live with.
What I Took From Babel 6
Babel 6 made me think about the responsibility that comes with future-facing code.
It is useful to write JavaScript that feels cleaner and more expressive, but the project has to carry the process that makes that code work in real browsers. That process needs documentation, version control and enough simplicity that another developer can trust it later.
The value is not only in the transformed output. It is in making the source code better while keeping the project reproducible. That is a good trade when the project needs it, and unnecessary weight when it does not.