Well, when I was a young 'wet-behind-the ears' sprog freshly posted to Scampton in errrmm....'64, the Vulcans had centralised servicing at 1st and 2nd Line. Working on E Dispersal, there was little contact with the aircrew and any association with Sqn pride etc was non-existent. Didn't stop us achieving the best serviceability levels that we could or taking pride in launching 4-ships from Kinloss QRA pans on Mickey Finns. Mind you, when the hooter went at 5.00am, you really did not know (for 4 minutes) whether to rush to the dispersal or wait for the mushroom cloud. But I digress.
At 1st Line level, to engender the Sqn spirit and to work as a close knit team in achieving the best levels of service and support requires aircraft and groundcrew to be firmly allocated to a Sqn. It also requires the aircrew to be full participants in the process and not to be stand-offish, as can (or did) happen. 2nd Line is different, due to the need to make maximum utilisation of the high cost resources needed, and to avoid expensive duplications.
So - centralised servicing = 1st Line bad, 2nd Line good (well, workable).