I don't use FCP but I do use PS CS6 regularly and it runs just fine. However, Bridge does not (yet) recognize any external device to import files from cameras or card readers in El Cap. It's a known issue talked about on the Adobe forums. I am now forced to use Photos to import my pics and then transfer them manually to Bridge to open in CS6. I don't know why it's taking Adobe so darn long to fix this issue.
There is no Bridge issue on Yosemite. Works just fine!
AFAIK, web traffic seems to indicate the FCP 6 works in El Cap.
Lou