Same impression, after a skim of the Github. Looks like a net complexity add in most cases, if I understand its Readme correctly.

Due to the software culture I've been exposed to, especially in web-dev, I am cautious about any level of indirection added by third parties. They may seem like a value-add to first-order, but when managed in the context of a larger system, tend to make performance worse, debugging more difficult, and modifications high-inertia. Not as a principle, but based on observations.

For example, When I see text like this: > With pre-built components for chat, presence, and notifications, as well as fully customizable UI primitives, Cord enables rapid implementation of sophisticated, in-app collaboration tools.

my pattern-matching brain thinks This is probably going to be slow, require the user to download a large amount of data, and may or may not reduce code required to implement, and will make customization and modification tedius. Maybe this isn't true for this particular library, but it seems to be a good rule, currently.