In general I agree with your stand and they desperately need strategic lift and tankerNice, but IMO overall the manufacturing rate in china is much too low !
How many of them are operational? We know 11051 & 11052 confirmed + two more un-serialled ones from Zhuhai (however reportedly on of them the final prototype) ... so this would be the 5th delivered to the 4. Transport Division.
Similar the rate at CAC producing J-10s and J-20s is much too low and even worse is the rate at SAC.
But don't forget that XAC is also responsible for a lot more than Y 20 They are also producing urgently needed H8 series.
With so many program going on simultaneously Y20, H8, Y8 , J20, J16, J10C, J11B money is getting tight