However, does the fact that a cosmetic delete function exists say that Google wants to allow you to actually delete something or just wants you to think that you are deleting something, and is this better or worse than Facebook, which doesn't even have a cosmetic interface to do so, other than perhaps removing your account all together, and has established and known TOS that say they can do whatever they want with the data you give them?
When I delete my account, any files (photos) I have uploaded are deleted. I don't care if I tagged someone in another photo which I didn't upload, it's their name there, not mine. If a message I sent is in someone's inbox, I obviously don't have any control (actually it depends, but let's take it this way).
It's like if I deleted my email account, I expect my inbox to be deleted, not an email I sent, which is in someone elses inbox.