Last year I said 'no way' to riding on ice and, in fact, never had to do so as I was lucky (well, it poured down with rain most of the time) with the weather/events.
This year I have been caught out three times on rides with ice. One of which was treacherous black ice over some Powys high hills which was so bad I could barely keep the bike upright pedalling uphill, and the descents were a case of don't brake, head for anything that looked dry/gravelly, scrub all speed and repeat. It was petrifying, slow and I knew if I went down I probably wouldn't be found for a very very long time. I couldn't even have walked as the black ice was like glass across the lane and the banks were pretty high. It was an enjoyable ride, and I stayed upright, but it's not something I would repeat. The following weekend was an A road blast around the Olde Folks perm. In all honesty though - I'm betting the traffic hazards would be greater in 'fatality' terms than the ice.
I never train/evening/social ride on the road bike in the ice, if it's icy I will be on MTB. It's got to be compact glassy snow for MTB to be really treacherous and then I have a studded front ice tyre for those conditions.
Now I have ridden a few audaxes in icy conditions I suspect I will continue to precariously do so, although it will be on a case by case basis and that's only because I'm stupid. I have a lot of respect for those who say 'no' to riding in ice.