The community members discuss a proposed feature that would allow CSS to be appended to the styles panel and vice versa. Several community members express enthusiasm for this feature, noting that it is planned or has been discussed internally. One community member mentions that the feature will be fully backed by the CSS data layer and synced with the style panel, rather than just a random CSS embed. Another community member suggests that the style panel may not support 100% of CSS, but the CSS editor will.
I believe this would be a great feature to have. Ideally, the CSS you would add for each element could essentially be appended to the styles panel attributes as well and vice versa.