Comment by causal

The biggest killer for any task tracker I find is an accumulating backlog of items that seem too important to quit but too intractable to make progress on. Often it's those exploding-in-complexity type things that you thought would taken an hour and it's constantly requiring refactoring into more tasks.

Accumulate enough of those and you start finding yourself writing more notes than you are crumpling them and can get demoralized pretty quickly every time you look at the board.