Configuring gives you a false sense of mastery. It works fine until the pre-made abstraction breaks, and then the "configurator" has no idea how to debug the underlying system because they skipped the foundational steps of building it.
That’s the 'abstraction trap.' Everything feels like magic until it isn't—and the moment that abstraction leaks or breaks, the lack of foundational knowledge becomes a bottleneck. There is no substitute for the experience gained from debugging the DOM and the browser engine itself.