The continued use of the CRP-5 in the PPL/CPL/ATPL exams in this day and age, is (IMHO) simply to test understanding of some very important basic principles of pilotage; diligence and ability to learn and apply. To argue it should be removed from the syllabus because it has been superseded as a practical tool is kind of missing the point....
Perhaps trainee pilots - who clearly are so immature that they need to further domonstrate those qualities - should do their exams using a quill pen and ink pot. Writing with such an instrument is clearly a skill which should not be lost
On a serious side, the knowledge and skills applied using an electronic calculator are exactly the same as those applied using a manual flight computer. In fact, using modern technology is far more relevant when you take into account the reduced risk of error inherent in an electronic device and on line systems for flight planning as compared to protractor, ruler and wizzy wheel.