I may be confusing the term with "disinterested curiosity". Wish I could fine the article if only to refer to again. Here's a bit of an explanation that seems to match my understanding of the concept:
https://www.tandfonline.com/doi/abs/10.1080/00221546.1943.11...
To my mind that's an engineer whose curiosity is uninvested in the outcome of the exploratory work.
I've known good engineers and great engineers and to some degree, they were all like Leonardo da Quirm, though not all quite as naive.