Pace
When you set the tolerances and standards, then you may expect others to respect them. Until then, you are responsible for operating safely with the existing situation, at risk levels you are prepared to accept.
Others have stated they are content to fly fast aircraft in IMC in the open FIR for reasons of cost and convenience, although flight under full control and segregation is available. Their choice.
Glider pilots in IMC are aware of their position very accurately, as otherwise they would risk infringing controlled airspace. They do communicate with others who are the greatest risk to themselves, and that communication is on a known and published frequency (although apparently you were unaware of that).
Before continuing to pursue what appears to be an obsession with clearly limited knowledge of the facts, please find out what you are talking about, as the gliding community on its part does.