You weren't quoting me but those are two things I use. I tether my iPhone to android because my Verizon 4S doesn't have LTE and do data and voice at the same time.
File manager is just nice to have to organize files. Practical use for me for example would be using an emulators. It's nice to connect my tablet to my computer and drag roms over into a dedicated folder. Or for work I have about a 100 pdf's I keep in a dedicated folder plus a thousand or so work related *jpg's. I take these pics with a camera I connect via USB and download them into that folder.
Exactly!
I don't wanna have to pay a data plan for my tablet and laptop when I already pay with my phone. Why not just use that data. Saves me a ton of money. File manager because I want to have control of where my files are and be able to put any type of file on my device. It also allows me to save my downloads to different folders based on what I'm downloading. Would you buy a Mac if it didn't allowed you to use finder?