I don't see the need for per-10-line splits. If anything, it just distracts you from the game. The separate splits would also not provide any meaningful information in something as short as a 100 lines category.

I mean, it wouldn't make much sense anyway as individual splits would be irrelavent. For example in your PB you might be on 9 lines and then get a tetris, so the 10-20 line split would start at 13 lines instead of 10.

But... it won't be useful? As Deer said,. not only is it a distraction, it's also very inacccurate, as with good rng a single 10 line segment can be, for example, just a few seconds long.

I think you're massively overthinking this topic. I appreciate your positivity and motivation, but on this particular point you're barking up the wrong tree, trust me. The effort - usefulness relation would be heavily skewed towards effort.