The other thing to note about Katie showing up in Wifey is that it will be a single path Katie. I believe it's the max corrupted one, but I dropped my patronage, so I don't know for sure.
I get his original reason for leaving, but just totally abandoning when so much work was done? Bad form.
Indeed it would have been quite simple to bring Katie's to some kind of open ending after she'd been raped so brutally. On the good path she turns around, marries Brian, stops working for Wright and becomes a doc and loving wife. This path ends here.
The other routes might continue like this:
Manipulation/Cheating: She marries Brian but continues to work for Wright. She loves being fucked by big cocks and cheats on her husband constantly.
Manipulation/Golddigger: She marries Wright and continues working for and under him. She is allowed to fuck others occasionally.
Corruption/Total Slut: She marries Wright and she loves it to fuck him and being whored out by him.
Corruption/Total Slut: She marries Brandon and both work for Wright. She becomes a whore.
The result may well be she becomes a 'trained fuckdoll' on both paths. Even the good path would have been open until the end and several scenes of the other paths might have been used with slightly different dialogues. Would be interesting to see how the dev explains Katie's development now in Wifey's. I found Hannah's Stockholm Syndrome quite convincing.