You're being alittle unfair on poor old awating sources
I usually leave a number up and once a fortnight one might start reloading all on its own, which is always worthy of celebration!
As I said, it is more often like once a week possibly, that doing a relevant search will triger one of these into re-starting ... but yes ... by and large it is a reasonably fruitless excercise
I am not sure exactly what LW does to locate Awaiting Sources files. An answer to that from someone who knows would be interesting.