Ryanair is the only operator that cares about the APS because they make money out of it through their contracted ATO's. They are pushing the narrative that it would give you a higher chance of getting employed by them though only a fraction of the new RYR P2F cadets did the APS MCC. The vast majority of the new P2F cadets did the normal MCC.
All other operators do not give a toss about the APS MCC and possibly have not even heard of it.