Why not the full IR, and the misconception it’s not a full IR?

The CB IR is a full ICAO IR, and the skills test is same as the full IR skills test. Only the route used to obtain the IR differs. The CB-IR isn’t a rating, but more so a route to the rating.  This is in sharp contrast to the normal commercial route to the IR via a modular or integrated course, where no prior experience is assumed.

The training requirements are reduced with 10 hours less flight training and 50% less theory, to make it more easy available for a larger number of pilots. The CB-IR does not include the HPA privileges.   As already discussed, this can be done later.  So if you do the ATPL theory and study for the IR via the CB-IR route.  Your CB IR includes the HPA privileges.