From this thread, it looks like most people now have a lot of SC appearances in their career modes.
For me that's not really the case. In almost a full season after patch 1.20 (50%, AI around 106), I had a single SC deployed (I paused the game right after an AI retirement and the moment I continued the SC message appeared, don't know if it had something to do with that), although in most races I had 1 to 3 retirements. All because of engine failures but more than enough in places that would justify a VSC or SC.
Anyone else has this behavior? I even tried it out with in a new career save, an AI even had an engine failure right before the castle section and parked it very close to the racing line in Baku but still, only a local yellow.