The other thing is by unitising the work, creating a platform separate to the airlines the barriers to entry for work get removed, apart from regulatory and performance standards including safety, thus creating a more competitive productive market irrespective of the bidding process and price mechanism enabler. It also creates more flexibility for resource providers making them more agile and less impacted by disruption like with the virus which reduces the burden on taxpayers
Each airline should have less than 1000 staff without question in the real world based on competitive forces and equal opportunity if regulated properly without bias. No need for Joyce's stupendous salary when really it was never needed since they had no competition
