I think most of the Pyret developers would agree wholeheartedly! To this end, the Pyret development team works closely (and in some cases, overlaps) with Bootstrap [1], a nation-wide program to teach programming to middle school students. The feedback we get from these teachers (and the process of teaching teachers) directly informs language design.
Furthermore, at Brown University, where many of Pyret's developers have ties, Pyret is dogfooded on two courses: an "Accelerated Introduction to Computer Science" [2] and "Programming Languages" [3].
(Disclosure: I am a developer of Pyret.)
[1] http://www.bootstrapworld.org/ [2] https://cs.brown.edu/courses/cs019/2016/ [3] https://cs.brown.edu/courses/cs173/2016/