Emergency vehicles - depends on the vehicle. Some do, some don't.
Maintenance - around here most maintenance vehicles often have only 1 beacon light visible. Recently LED on/off strobes have started to be used rather than the more traditional bulb & rotating reflector.
Bin lorries - see above
Indicators - They run off an a relay which keeps all lights synchronous. The same goes for hazard warning lights.
Various other lights - Crossing lights tend to be synchronous. Beacons on skips etc tend to be single visibility strobes. Most of the railway crossings I come across use both synchronous & asynchronous timings as are moving traffic direction beacons...
hum... so maybe not eh!
Also I'd put money on you confusing 'seeing' & 'identifying', the latter has a surprisingly low relevance in good observation. It's a classic mistake I see people making all the time when driving. As I've said before, one of the best bits of observation I've ever done came in the comment along the lines of "Something fast moving in hedge coming into road" as I did an emergency stop... then a child ran into the road. I was stationary because I knew that something was going to enter the road space. I hadn't the opportunity to directly see the child, but because I was for movement & direction I instantly recognised the reflections & shadows which let me know what was going to happen. Most people wouldn't have reacted & may well have hit that kid in my position.
I don't confuse those so you'd loose all your money, and I'm well aware of the general effects and visibility of flashing lights. New emergency and utility vehicles are nearly all fitted with lights as I described in order to be seen.
The issue here is being seen as a moving bicycle, not being recognised as a pedestrian crossing or refuse vehicle.
At night a steady (and bright) white front light means I have only minimal problems with motor vehicles or other road users. A flasher on its own seems to render me invisible, as it does for other cyclists when I'm driving. It's also annoying.
I've previously described my preference at the back, and why.
How you choose to light your bike, if it's legal, is your decision. I'll continue to light mine to give me the best visibility and driver response.
Within reason I rate the most important factor in bike lighting as brightness, especially when I'm in South London.