You seem to be under the impression I haven't programmed in Lispy languages. And our data are from students using DrRacket, which very much has paredit support. These are just inconvenient truths.
DrRacket is an IDE that supports many languages. The curricula that Shriram has used at Brown, and that others have used in many other places uses a sequence of smaller languages designed for teaching.
Our studies were on students using Beginning Student Language, the smallest of the languages built into DrRacket. It is much smaller than the Scheme used in SICP.
