Yeah I did buy one actual sliceplanner but didn’t like the form factor and never integrated it digitally. Agreed it’s a “gee-whiz”/ meh feature, for my uses anyway. But I loved its visual time-tracking idea and lifted that into my custom bulletjournal system. I use terrific little paper journals (Moleskine Cahir quad-ruled 5x8, one per month.) I crafted a circular clockface template which I stash in the back cover flap, and use to draw a 12h clock for each day, in pen. (I put am stuff inside the circle, and pm outside, to account for overlap in my ~15h days in a single clockface.) Having the paper journal completely offline and separate from phone or laptop is ideal for me - not just for time-tracking and planning, but also for ideas and misc notes. There’s something special about a graph notebook and a good pencil (GraphGear 1000 0.5mm, best $11 I ever spent).