I'm with VeeAny and Rotorfossil on this one, re the H-V curve and the rest.
The constant angle approach (tapering airspeed and height together on the approach) has the additional benefit of being the best technique when power is limited: quite often in the case of the R22 when 2-up!
There are other benefits for advanced flying, ie confined areas, night approaches and hilly/mountainous terrain approaches.
And if you have an hydraulics-out approach to contend with, in, say a 206, 120, or 350, it's much better to fly a steady approach than to come whizzing in at 60 KIAS and then try to flare off the IAS, with changing and possibly heavy control forces.