@Sven, many people do that. (Integrating external JS framework into Phoenix.) As of now, in the idiomatic Phoenix way, there are no component libraries that can compete with w2UI or smelte or for that matter any JS web UI frameworks.
However, petalframework/petal_components: Phoenix Live View Components (github.com) is making a serious attempt to fill that gap in the phoenix world. If the components provided do fill your needs to certain level - I suggest, you start in those lines. Mainly because, one framework less is always one headache less. Further, you can write your code mostly in typical Phoenix way.
