Am I missing the part where it says the specific use cases the author is speaking about? It sounds like their arguments are based on ”real-world” development, while my guess is that Racket might fare better when you’re looking strictly at a tool for learning.
At the beginner (high school / undergrad) level all Lisps are more or less the same. The finer points of Lisp-1 vs 2, CLOS, etc. are not comprehensible without a lot of prior work.. and by that point you should optimize for real world practice anyway IMO (something which many university courses do not do).
If we're talking middle school then there are some arguments to be made that Racket's easy-to-use graphics libraries are more conductive to learning. It will never be Flash though.
I am surprised to hear that multiple namespaces with identical symbols is not a source of confusion for learners. IMO, in high school I would've been lost.
