The entire brand extension has been quietly dropped. You have "Raw" talents challenging for "Smackdown" titles on ppv. You have huge numbers of guys appearing on both shows. It is finished. The only remnants of it are all the championship titles on the shows.
Admittedly I haven’t been watching much recently but I checked out raw last night and I have no idea who’s on which brand other than the people with the brands name in the name of the title they hold and even then I’m not entirely certain all the titles are even held by people on the respective brand