Thing
You maybe up at FL95 on top Flying OCAS you start a descent to make a cloud break at 2000 feet to fly to a small airfield.
You enter cloud and are now in IMC descending so cutting many levels and not flying Quadrantles.
It happened to me with TICAS. Nothing showing transponding until a glider in cloud flashed past clearly visible in the cloud so very close.
i made a report on this near miss.
There is a risk but flying IMC/OCAS without radar and sometimes even with radar there is always that risk.
Flying OCAS IMC you try and reduce that risk as best as you can flying Quadrantles helps but its not an answer to all evils.
The only answer to that is to leave in CAS, cruise in CAS and arrive and land in CAS
Pace