If I was writing the syllabus for a CPL flight test (hohoho, what fun...), I'd think about it this way.
- Will a successful candidate probably spend a few years flying commercially, SE piston VFR, over terrain likely to make a forced landing a challenging exercise?
- At some prior point in their training, have all candidates demonstrated competence in the forced landing to a CPL standard?
If the answers are yes & no, respectively, I'd want to put a forced landing scenario into the test, regardless of aircraft type. For the sake of the future punters, you understand...