It's way smaller than modern phones, though - I clip mine to the back of my Samsung (magsafe case) and it only blocks one of the five cameras. (phone: 288g xtelink x4: 75g.)

(also: hasn't the x4-v2 already been announced that is supposed to have a frontlight?)

(having it right there mostly serves as a physical token/reminder that I don't want to get sucked in to my social media and other phone apps as much, so if I'm just using it to fill "politely waiting" time I can just grab the x4 instead. I also have a trivial pandoc-generated epub todo list as the first document, though that would work better as a crosspoint fork/feature really...)

You read on a phone and on a tablet, so the X4 probably isn't for you. I hate reading for long periods on LCD screens. I have to do it all day at work and I don't want to do it at home. I read on a kindle unless I really need a computer screen for photos or graphs. I am just not going to pull out my phone to read a book, so an X4 sized device makes it easier to have a book with me. Since phone reading doesn't bother you, I doubt you would get much out of an X4.

it's pocketable!

that's the main for me: i also have a kobo and bringing it around with me is just too damn annoying.

being able to pocket this thing and read anywhere one handed is so nice.