Soo I had a VS interview that I felt went well, but on reflection I have realised that I totally missed a why them question. I was asked what was my stratergy for applications and I just stated it, I didn't link it back to them or anything . And now I've realised I didnt say why them for me other than in my applications. I did discuss things about them in other questions, what sets them apart, depts, etc but not like why them for me. This is a complete fail right, even if everything else went well?
Seriously, 100% don't worry about it. I didn't say 'why them' one single time in my interview and it was fine. There's no need to answer a question they haven't asked.
Also, I know it's tempting but don't endlessly rehash your interview in your head! It won't have any productive effect and it'll just make you feel awful, probably needlessly so.