I view one of the primary differences between the two in that aspect of reset. EI requires it at high levels and ~weekly, rightly so, whereas PPS tends to be more flexible, in frequency and quantity, as it tries to more closely match uptake with dosing. This a major factor and circles back to the water change frequency thread we were all discussing last week.
They both have fixed-dose starting points, which is what the calculators use, but both philosophies recognize the desire/need to be flexible. I do believe that, despite flexibility around their mean, they remain quite far apart on expected water column nutrient levels.
I consider myself much closer to the PPS philosophy, in recent years, after many years with EI. @Greggz
: it would be interesting to hear which approach you believe you are closer to now.