Because even their CSS implementation will still be css-in-js, not to mention that this framework seems to be going in a slightly different direction than mater

Because even their CSS implementation will still be css-in-js, not to mention that this framework seems to be going in a slightly different direction than material-ui. Not everything can be done in a PR. I doubt the callmeall people would enjoy someone switching them to SASS, or rewriting some of their components entirely to work with a keyboard easier, or any other major changes. And what is "half baked" about this? Besides being newer, it doesn't look any worse to me at first glance.