I agree, but it should also describe what Scheme continuations are, compared to the delimited function object continuations that are used in practice elsewhere.

However, the notion is technically subsumed within the notion of a "simplified" language, as Scheme continuations are a low level operation quite often used to construct what other languages have out of the box.

Probably nobody had the time or knowledge to list all the features of the various important Scheme implementations, find the important ones and find out whether they exist in one of the various CL implementation or the 2..3 Clojure implementations.

I'm not surprised that the answers were not useful.