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Variable speed of light in different materials is much more relevant to our daily life as we don't live in vacuum. I can read this text thanks to the effect of light slowing down in the lens of my glasses. So yes, it's actually a good example of an use case when setting the context is actually important.
In case of 2+2=4 it's the opposite as we're used to decimal system but the case of 1+1=10 would clearly need setting the context.
