productivity porn, ie. yet-another-task-management-strategy (or similar) is self-perpetuating
because
it doesn't address the central issue of most people's non-productivity
procrastination and prioritizing, which are both emotion-management issues, not "time-management"
and, it makes things works, because it is a time-consuming panacea that gives hope
reading about some new system, and adopting some new system make you feel good, (and feel productive), but take up time, and defer the actual work to the future
ie. develop a bad habit of "spending time on managing goals" vs "actually doing them"
"re-organized my plan for this project, that's progress! and enough for today!"
(obviously, some planning is important, but most individuals who struggle with "productivity", aren't doing so because their projects were missing a complex GANTT chart)