In Photoshop, we can convert the a layer’s layer style (called layer effect there) into a new separate layer.
It’s especially useful for “stroke” style. Stroke creates an outline around the layer content, effectively enhances the lineart. But sometimes it’s a bit rough and required further tweak. In Photoshop we can separate the stroke into a new layer and tweak it there.
In Krita we can flatten the layer… and that’s it. It works, but not non-destructively as Photoshop’s workflow.