If you're stupid enough to fly in IMC without a service of some sort
Well, you can always get "a service of some sort", such as a basic service from London Information, but some of us have jobs and only get to fly at weekends when there isn't any radar service.
And when there is a radar service, so what? "Traffic in your two o'clock, converging, no height information." Well, it's 100:1 that they're bimbling along at 2,000' VFR below the cloud, isn't it; but if they were in the cloud too what would you do about it? Sure you could turn right a bit, but if you divert around all of those you'll never get anywhere.