> Sometimes I really wonder how people use their phones. Is it really necessary to go the extreme of needing to turn it off just to "fight off" the "addiction"?

I'm running a business on my phone, so for me - yes. If I pull out my phone to take a photo on a Sunday and I see that a big client emailed into support, I'll get distracted and feel the need to respond quickly. Monday through Saturday, this is the proper reaction - so I need at least one day a week to disconnect and enforce more strict boundaries.