When cycling I fully embrace the roadcraft approach to indicating. I've had nasty situations arise from signalling.
For instance, try turning right here. Remember that your right hand is for the front brake, and there's a nasty unsighted junction on the left!
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Signalling on a bike reduces your control of the vehicle. So I only signal when it benefits another road user
and is safe. If a signal could benefit another road user, but would be unsafe to give, well, f

ing tough. If signalling won't benefit another road user, then potential danger is increased for no good reason. I try to be very communicative with my road positioning, which is another factor.
Depending on signals for your maneouvre to be safe is the height of folly. Signals should only ever be a courtesy, not a "I'm doing this and if you don't react we're going to crash".
In a car, I signal most of the time, excluding circumstances like one where I'm in a dedicated turning lane and I feel my movement is obvious. There's not the same loss of control.