Groove-Based

Just a reminder: the keeping of an ostinato (and especially a simple one) allows you to musick at the same time as concentrate on (item by item, cyclically or Gestalt) various aspects of playing: form, feel, awareness, etc., If you're thinking about forward movement all the time, about what comes next, where it could go (or where it can't), etc. it seems to me that at least some of your concentration is diverted away from those aspects of playing.