Thanks for your feedback! Your idea sounds interesting, but we need more information:
We are certainly thinking about extensible user schema across Office365 suite, and trying to figure out which attribute mappings make sense. We’d love to know more about the scenario you have – Why did your customer chose to use AD custom attributes over User Profile attributes in SharePoint?
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My company is acquisitive and when we onboard a new company to our tenant they have not always used the same AD field for recording exactly the same information as we do. therefore when user profiles are created/synchronised we can't make the best use of these in workflows etc. It would be really useful to be able to promote custom attribute fields to push information into user profile alongside the standard ones. (as you previously could do in on-premises environments)