More worrying now is the lack of service OCAS flying IFR. A lot were military but we all know how even the big ones open at 0900 and close at 1700 so we are very much on our own if flying OCAS.
That's emotionally worrying but not statistically supported. Midairs in IMC = 0 in the UK, to date.
However, if you have an IR and altitude capability, you would not be flying low level OCAS. That is what "low end" piston twins have to do, because they cannot practically provide passengers with oxygen. With a pressurised single you can get a reasonable utility (limited by airports) but can't do legal SE PT in Europe