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>it being about my Mum being able to use it without having to phone me saying that it's all gone wrong again

You're confusing correlation with causation. The fact that your Mum has been unable to use devices in the past is not _caused_ by the devices being open platforms. Lots of people can't even operate a dvd player and they are certainly locked down devices. Being easy to operate and being locked down are mutually exclusive.

You don't mean mutually exclusive. You mean independent.

If events A & B are mutually exclusive, it means that if A happens, then B cannot happen, and vice-versa

or maybe orthogonal?

Would also be a good word. It taps a different area of maths for its metaphor.

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