I don't know if that is really the same principle as the pottery anecdote however, it's not about experimenting but a narrative enforcing the concept 'practice makes perfect', related I suppose but not the same.

And anyway the pottery principle is not really sound either - I can suppose that the group tasked with producing a pot a day produces a better pot at the end than the group that was given a long time, but let us assume pot-makers both extremely skilled - one is tasked with making a pot a day for 30 days, the other making a pot in 30 days - which pot under those conditions will be better? The pottery principle is only interesting in explaining how to build a skill, but does not have anything to say about what to expect from those who have already mastered a skill.