I don't think you understand what is being discussed. Nobody is confused about what tail recursion means. We are discussing where it can be applied, and where not.
So basically my complaint in >>35 is justified - the language does not allow you to implement certain efficient algorithms, due to its inherent limitations?
What if you assume you have functions like "readarray" and "writearray" to do random access to memory arrays? Which points in >>48 could be implemented efficiently then?