The web historically moves in waves.
Libraries are created to push complex features in an easier way. Then the libraries themselves get complicated, often more so than the benefits they provide.
Eventually, (some of) the core features of those libraries make their way into the browser itself, but the libraries linger like water on the shore, slowly receding.
And before the sand has a chance to fully dry, a new set of libraries washes in to push the web even further.