I took out the clutch spring at 200 miles. I use my GT/PP as a daily driver and have zero problems even without the clutch assist spring. In fact, I much prefer it this way.
I will admit that my foot gets a little tired on my way home from work but I'm on my feet most of the day, and have an hour drive home at 20mph. Other than that, normal city driving when NOT in rush hour is eaaasssy.
And as others said, the clutches on PP vs. non PP are the same.
It is ridiculously light even with the helper spring removed, compared to every other 3 pedal car I've ever driven. A 90 year old woman with osteoporosis wouldn't have any issue.
The clutch is very light and no issue at all. The car is very easy to drive in city traffic. The abundant torque is a big help, it's actually easier to drive than my old BMW 325Ci.