ANOTHER iTunes update. ANOTHER 55MB. Does Apple not know how to apple patches or something?
I take it you are equally annoyed by Microsoft's "patch Tuesdays"?
The point here is that Apple doesn't patch. They send down the whole installer and reinstall the product, all 55 MB of it.
That's rather large for a point release.
If you release a product and then keep patching it instead of updating as a whole, you end up with an unmanageable mess. It is much easier in the long run to release a complete update than keep supporting various patch combinations and make sure they all work
together. Hint, hint...