With the increasing availability of FPA/FPV in more modern aircraft, particularly SELECTABLE FPA/FPV, it would be highly appropriate to provide SID and APPROACH paths in Degrees, not % Gradient.
Conversion to a required V/S truly makes a Non-Precision Approach just that - Non Precision (and crude at that). The sensible use of FPA/FPV makes a Non-Precision Approach into a Semi Precision Approach, properly done, you can expect to break visual on the PAPI/VASIS every time.
Regards,
Old Smokey