Dick,
The issue of see-and-avoid and radio-arranged separation isn't exclusive, as you choose to misrepresent it.
Neither Bloggs, nor I, nor any of your usual ideological opponents here, are advocating using the radio instead of looking out the window. Rather, the radio is used as an adjunct to all the other means of avoiding other traffic, including visual separation and latterly ADS-B and TCAS.
In the cockpit of a 2-pilot jet, there's precious little time to be staring outside, so the radio has to assume a greater role. That in turn requires that others in the airspace do their part to play the same game, as they have an equal investment in avoiding loud noises.
If you don't have a radio, then that option isn't available to you. But if you do, as with most of us, then it's irresponsible not to use it. Most of the incidents in your quoted extract related not to the use of radio, but to its failure due to cockups of some sort.
Your opposition to radio separation in G is well known. But please stop using specious arguments such as this to support it.