Serious question: why would I pick this over literally any other UI framework? They all look exactly the same and implement the same UI patterns (hamburger menus, drawers, modals). Literally what's the point of any of them when they all di the exact same thing: make your website look like every other flat, colorless website
So you haven't realized that these libraries are offering skeletal components that you style and modify yourself? They offer functionality, and you bring your visual language.
That people use these libraries in uninspired ways, is not a condemnation of the library itself.