That's a good point and i will start out using the raker flat file, and check the height of the rakers if they don't need filing again i will remove the flat file till it's really needed.
In the past i have just used my chains till dull in the woods, maybe slap on another chain then take chains to a shop who do machine sharping.
And i still feel you can just do the hand filing maybe five times, before needing all the cutters really taken to the same height this is where a machine sharpen will get the chain back where it needs to be.