The bigger picture is that a very large number but probably not the majority of 'aircraft' do not have radios installed.
My old aircraft did not - and obviously that colours ones perception. Flying from a licensed field in club aircraft - surely everyone has a radio? Well nearly.
Without a radio the OHJ works, well it has for 80 year odd. IF you can invent something as reliable that does not depend upon a radio great, I'm all for it.
I'm sure many of the 'issues' with the OHJ are around people's unfamiliarity with it - due to ATC controlled fields and radio and not having the freedom / responsibility to do it themselves.
You see this to some extent in the number of fields that are beginning to restrict non-radio traffic. But at the majority of strips - where these days there are more light aircraft based than at licensed fields you can have a dedicated frequency, Safetycom, microlight or gliding requencies in use. Not surprisingly the OHJ is about the only near universal procedure.