You can start with the Web Components Community Report: https://w3c.github.io/webcomponents-cg/2022.html

Or with opinions like this: https://dev.to/ryansolid/web-components-are-not-the-future-4...

O if you want to go down the technical rabbit hole, you can search for all the issues people have with them, e.g.: https://x.com/Rich_Harris/status/1841467510194843982