What this all boils down to is that the Fedex drivers dont want to take the time to wait for you to come answer the door and sign for the package. If they skip all of this for half the packages they have to deliver, they can save an hour total of the day.
Now not all drivers are this way...only the ones that care about themselves only. The driver that comes to my door seems like she's scared to know what's in the box, but she does know it's a live animal and nearly beats my door off the hinges to make sure I come quickly get it out of her hair.
I have literally sat at a window and watched a ups driver pull up, run to the door with no package in hand and stick a "sorry we missed you" note on the door. This was because it was close to the end of his day and he probably had several packages left.
I know we all like to get home on time, but leaving live animals unattended at a door is unacceptable