I haven't done any ab-initio (or indeed single engine) instruction for a number of years. However, it used to be the case that in the UK it was a requirement of the syllabus for the PPL(H) that EOLs were included, and certainly for the CPL(H).
Has this changed?
If not, then surely the instructor should follow the syllabus and the examiner flight test according to it.
If you want the rules to change, then people should lobby for such a change.