I read on Twitter this week that someone made such an interface on top of GIMP.

Yeah, there have been similar things before it as well. I was thinking more of a ground up photoshop style editor with GEGL as the backend

	▲	cgyvbunji 18 hours ago \| parent [-]
		Never did understand why gimp's ui isn't a Photoshop clone, or more broadly, why there isn't one canonical Photoshop clone like libreoffice is to Ms office.