I think you are just being argumentative, A low carb, high protein and fat meal always doesn't spike at 75 or back to normal at 120 minutes, In fact a lot would say it is rising at two hours, hence the splt bolus for low carb meals. Protein can digest for up to 6 hours and fats for 8, AKA the pizza effect.
so in summary, you are paying 25% more for the same 20% accuracy and a 3% or 3 strips out of 100 improvement at 15% error. Your example of meal testing at 75 and 120 minute point of time, has a greater variation than the extra 3% or 3 strips out of 100, strip error at 15%.
You have made a very good case for CGM though.