One method of continuous deployment is to decouple deployment from release, i.e. deploy updates without activating the changes immediately.
I know that feature-toggles can be used for this, but I'm wondering if there are other techniques for "non-features".
For example, would you build a feature toggle for a bugfix? Probably not and one could argue that bugfixes should be deployed as soon as possible, because it can only get better. And after a bugfix has been released, I sure don't want to toggle it off anymore. But is this the case? It might be a risky change that you want to release in a controlled way. And if there are unexpected side effects, it's good to be able to roll it back. So, feature flags for every change?
And what about visual changes? For example, can you implement something like a feature flag in CSS? Does it even make sense?