I agree with all of those things cept points 4 and partially 7.
4. You can download the game over again from the PS Store, so if you only played it a couple times, you can delete it, and free room, with the option to download again at a later time if you wanted to.
7. You can download using a USB since the PSP Go uses a USB charger. If you look at the charging cable of the PSP Go, you'll understand that it can separate in half, unveiling the USB cable. Thus being able to download PSP games through the PS3 if you have one using a wired connection. However, all games I've downloaded wirelessly through it have rarely ever exceeded 10 minutes.