Adobe Camera Raw, applied inside Photoshop as a filter (typically on a smart object, i.e. a smart filter), is described as carrying "the full power of Lightroom built into Photoshop." It gives RAW-style, non-destructive editing controls without leaving Photoshop or round-tripping through Lightroom.
This makes Lightroom optional in a non-destructive workflow: RAW files can be edited via Lightroom → Photoshop → Lightroom, or edited directly in Photoshop using Camera Raw as the master filter, skipping Lightroom entirely.
PHLEARN, "The Ultimate Guide to Non-Destructive Editing" (PRO trailer).
Из тем: Photoshop Foundations: Non-Destructive Editing & Selection