Yes I think you're right, thinking can only be high or low.
I guess this idea would be more focused on behaviour (expressed actions) vs. mindset then. E.g.:
  • high time preference behaviour would be being forced to not save either because you don't have extra income, or don't have access to good savings facilities
  • low time preference behaviour would be being able to stash away bitcoin for many years in cold storage
Mid time preference behaviour could then be something like being able to carry additional income from month-to-month as bitcoin and being able to choose when to spend from that stash.
I think it's generally interesting to frame a set of habits/behaviours that can eventually get you to acting in a low time preference manner, because not everyone can get there from day 1 practically.