I remember things better when I write them down, so having a paper checkbook is a must for me. I write my transactions in every other night or so, which isn’t often anyway since I don’t spend much. I’ve only had one overdraft and that was because I didn’t have direct deposit for a former job, and the stupid “first $100 applied immediately, rest on next business day” policy kicked my checkbook’s butt when I deposited my check.
Not having a paper checkbook sounds very scary to me.