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The idea means the device can cater to an individual person's field of work.
But what you've mentioned are only proposals of potentially infinite modules that could exist, there's no rule saying you need to include a watch or a compass or anything!(just don't get silly).
For the average user though, there's always the possibility of upgrading to the latest and greatest camera without having to scrap the entire device. If not for yourself, do it for the environment. You only get one earth(for now).
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Let's briefly narrow down the possibilities:
If you initially have a small target market, you're going to have a relatively hard time sufficing to their positional and personal needs. Accounting for this, many investors and manufacturers will be screwed and go out of business.