If I understand your setup, when you decide you want to a new movie you have to download it, pull the hdd over to the machine, transfer it to the hdd, rename, perhaps even transcode, and then put the drive back on the TV.

In the type of setup described above or like mine, I can pull out my phone and using a very simple search all of the file handling and such is taken care of for me. I don’t ever have to worry if I have the right filetype for the device I’m on, and I can watch that from any device on my local network, or just about any device that has an internet connection. Also, while I’m watching one thing, several other people can be watching whatever else they want on their devices.