What planner type(s) do you know would not ever work for you? Or that you have tried (maybe more than once) and it fails disastrously every time?
For me, it's day per page planners. I've tried so many times to use them as my planner, because I love the level of detail I can capture on each day's page. But the lack of forward planning leaves me "lost in a sea of individual days" as I call it. When I use a day per page planner, I also have to use a weekly planner for forward planning.
I know people who need the flexibility of ring binders, and bound planners would just not work for them. I also know people who can only use bound planners, because they hate writing around rings and they tend to lose unbound pages. As another example, I have a friend who has five kids, and she has to use a monthly planner. Anything with a shorter range does not give her the ability to plan ahead like she needs.
Which planner type(s) could never work for you?
And as always on Fridays, feel free to discuss anything planner related!