There is a technical reason for DENYING such an automatic upgrade:

The general class test has "many" questions involving HF operation.
The technician class test has few to no questions involving HF operation.

The reason is simple: They should not get a privilege that their test did not
ask (or potentially ask) about.

[For those of the "dumbed down" school: They should not get a privilege related
to a topic for which the question pool lacks a "token question."] :-)