The reason I used a physical logbook is that if you use software, you have to have the software and the logfile on-hand all the time. You can keep them both on a stick, of course; but you still need the right OS/FS drivers etc. Also, your screen and keyboard may be connected to a machine that's crashed, or being repaired.
And it's easier to scribble a line in a physical logbook than to crank-up some editor, open the logfile, append an entry, save the file etc. If you're going to log absolutely everything, then adding an entry needs to be as easy as signing your name.
You could rely on your laptop; but laptops break and crash. a physical notebook is crashproof, drop-proof, and can even survive being dropped in a puddle. And short of pencils and erasers, it's intrinsically an append-only medium (except that you can still annotate old entries).
Maybe an electronic logbook works for you; I found that my logs were more comprehensive and generally easier to use if I kept them on paper. I got through about two notebooks a year; I used a stack of old ones to elevate my monitor (phone directories are hard to come by these days).