Glad I've only got a cabin bag for Saturday morning to BOD.
Akrotiri bad boy has nailed the matter. Companies think they can save money but when the proverbial hits the turbine blades they are left carrying the can to their customers. They think that Service Level Agreements will work but the ONLY thing that gives you control of staff is controlling their pay and security of employment. In my view, contracting out does neither.
One quick example: Some years ago (2006/7, I think) fuel tanker drivers went on strike in what was (I think) illegal secondary action. The company ultimately paying for the drivers to deliver their product had outsourced the contract to a big Italian Company, who had outsourced it to a local UK company. It took several days for that chain of command to made to be made to work and tell the drivers to return.
I saw this trend start in the USA in 1988 (my then employer was doing it) and I didn't like then. Nothing I have seen in 26 years has made me change my mind.